Ubuntu :: Editing /etc/sudoers Don't Want To Mess Up Again
Feb 16, 2011
I edited my /etc/sudoers file the other day to add timestamp_timeout=0 to cause sudo to ask for a password every time. I used visudo in sudo mode and when it came to saving it appeared to want to save the file as sudoers.tmp so I edited this to sudoers. Anyway some how may edit failed. I booted up into terminal and reedited and somehow lost all access to the sudo mode. I think the file ended up with the wrong permissions.
After a fresh install I don't want to mess this up again. So please, please tell me how to save it. Should I save as sudoers.tmp or sudoers? I presume a could have made a typo, but am assuming not. I don't want to reinstall ubuntu and all the packages again.
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Aug 2, 2010
In a recent discussion I had, I was led to believe I could use sudoers to restrict using vi (for example) for the editing of say specific config files. I know how to allow root use of vi and how to lock it down from getting to a bash prompt with NOEXEC tag,but I can't figure out how to restrict the use of vi to only edit certain files. Tutorials and howtos I have checked don't address this
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May 31, 2011
I have tried several things to attempt to fix my sudoers file however it is still coming up with errors. The error says
[code]...
the sudoers configuration file is set to the default as I have ran a dpkg on it, have also uninstalled and reinstalled it, and went over the configuration file ensuring it looked like the defaults I had seen online.
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Nov 22, 2010
A month or so ago I installed the beta version of FF4 - it was too buggy and gave me problems so I uninstalled and went back to FF3.x.x -or so I thought. For some reasons it set the PPA for daily updates and I ended up with Namoroka updating nearly every day, at present version 3.6.13pre.
I disabled the repositories and have been using it but I have noticed at times it 'freezes' i.e. high CPU use and also when typing into a textbox, like this the text is slow to appear. I want to go back to my original FF3.x.x version that came with 10.10. Can anyone point me to a tutorial or take time out to reply here with a procedure to do this?
Edit: I have checked with nautilus and I seem to have various firefox folders all over the place - and a bunch more mozilla folders :
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Oct 27, 2010
Is there a way to permanently mess up a pre-made dvd?
i would like to be able to mess up a dvd through software, that way there would be no proof of tampering. (i want a few new movies on blueray )
i would like it to run in ubuntu, but a windows program is fine.
these are factory dvds btw, not dvdrw.
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Jun 6, 2010
I have an old laptop that I installed EasyPeasy Lucid on. I have never used Grub2 as my other Ubuntu installs still use Grub Legacy. I have studied all the tutorials which instruct that the grub.cfg file should not be edited directly.This old laptop has one of the dreaded Intel graphics chips for which the kernel automatically loads the i915 module. Of course (like a multitude of others with Intel graphics and Lucid) I booted into a black screen but knew the workaround was to enable mode setting through grubI used the
Code:
i915.modeset=1
and added it to /etc/default/grub line GRUB_CMDLINE_LINUX, just after "quite splash", just
[code]....
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Feb 19, 2010
for the first time I've gotten my hands on a ASRock ION 330HT and set it up as a front end to my existing front/backend which sits in the living room. I have EVERYTHING working but I've found an annoyance which is probably as a result of one of my screw-ups.
Basically - the backend (/frontend) stores it's videos in the default /var/lib/mythtv/ blah blah blah. This has always worked. I copy my video files there, rescan and bob's your uncle.
With the ASRock, I'd like to store some files locally, so currently the videos folder is set to /var/jan/Videos. I'll work on smb mounting later.
When I scan that, the videos also show and bob's my second uncle.
HOWEVER. After the scan from the ASRock, my MAIN box also is looking for files in /home/jan/Videos (which doesn't exist there) and finds nothing. If I rescan - all is good again. Then going back the the ASRock, IT is then looking for the files in /var/lib/mythtv etc. and finds nothing.
Why should setting in EITHER frontend mess with the setting in the other? That kind of defeats the purpose of having multiple front ends with multiple hardware/software configurations right?
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Feb 24, 2010
I had grub trouble with a hardware change and have been trying to solve this. I think I have done more harm then good. I can not boot into Ubuntu or Windows 7. Here is the boot info script and other info on my problem. Can someone please help me with this,
Code:
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
ubuntu@ubuntu:~$ sudo os-prober
/dev/sda1:Windows 7 (loader):Windows:chain
[Code]....
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Apr 14, 2011
My main account 'dave' runs as admin etc This was the output of 'groups dave': dave adm dialout cdrom plugdev lpadmin sambashare admin I was trying to add dave to the user group 'media-www' and i ran this command: 'usermod -G media-www dave' Then after another 'groups dave':
dave : dave media-www It seems to have removed all the other groups! How do I restore this?
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Dec 17, 2010
I have used Evolution for 5 years with no problems but it really makes a mess now. It keeps on copying or moving already sent messages to my Outbox, hence it keeps on sending mails again and again (and again).Is there a bug I should fix?Is there a (better) alternative for evolution?
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Jan 20, 2011
I need to know how to get fix my windows xp system without messing with Ubuntu. I can get inti Ubuntu but on windows it says NTLDR is missing dose anyone know what I can do because I still use windows once in awhile so it needs to work.
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Jan 31, 2011
Without a long tale; suffice it to say I had to do a clean install when I upgraded to 10.10 version. I have messed up evolution e-mail and my document viewer settings. I have what I need as far as by ISP settings but the Evolution folders; well that is messed up. What I am looking for if it is out there would be links {read directions to} tutorials for Evolution and Gnome. Everything comes into the unmatched folder on evolution so I think I need to find where to read up on 'Folder rules and permissions'. The document view just is not working so I know I need to read up on that; I think it is part of Gnome but I'm not positive.
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May 11, 2011
This post is a follow up to this one: [URL] My computer is an IBM R52 running Windows Professional (previously dual-booting with Ubuntu 10.10, but that's gone now, and I don't dare reinstall it until the HDD partitions and mbr are properly working again). I think that the shred command mentioned there simply messed up my MBR, and maybe my partition table. Here's the partitions on my HDD:
Code:
Disk /dev/sda: 60.0 GB, 60011642880 bytes
255 heads, 63 sectors/track, 7296 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x7e93bd30
[Code]...
My question is, is it safe to use something like SuperGrub to repair the MBR? I really don't want to mess up the Windows and recovery partitions. I've done plenty of research on this, but am not confident until someone says that it works in my case.
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Mar 29, 2010
I've played around with some themes, installed, activated and deactivated the emerald theme manager, etc. (I'm tired and did a lot of stuff). Now several things aren't alright:
- I've chosen to initiate the windows-switch-thing with mouse button 2. It dowsn't work anymore.
- The transparent background of my temrinal is too transparent - meaning: It always shows the desktop picture
- I've assigned all my media players to workspace 4 - it doesn't work anymore
Is there a way to just reset compiz to its original settings? PS: I know the informations I've given are kind of vague, but I'm too tired to do more. It's Ubuntu 9.1 and I'm using Gnome, not KDE.
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Feb 14, 2009
I'm trying to dual boot Fedora 10 and Ubuntu 8.10. I have installed Ubuntu first than Fedora (with GRUB installed on it's partition) but Ubuntu's GRUB got messed up. I reinstalled Ubuntu and now Ubuntu works fine but I cannot boot my Fedora. I have set "/fedora" as a mount point for the fc10 install and I can see that from Ubuntu but I can not boot into it. I no longer have any idea where to search for some way of getting it to work without reinstalling ....
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Feb 13, 2011
Finally ran the upgrade from lenny to squeeze and ran into a few issues. I have to admit this is the first dist-upgrade I've ever had go this badly (kernel issues, xorg issues, mysql transition problems, mythtv... Yikes!).Anyway, the first problem I'm trying to fix is getting dpkg to like the new squeeze kernel. Here's the errors
Code:
Errors were encountered while processing:
linux-image-2.6.32-5-686
[code]....
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Jan 8, 2010
I've been enjoying using Rhythmbox to rip a stack of CDs. Initially I had problems getting it to recognise Lame but following uninstalling and reinstalling it, it seemed to be working well. That is, until I looked in my Music folder.
It turns out files have been placed in individual folders, named "number - title.udio" (e.g.: "11 - She Can Do What She Wants.udio". The mp3 file itself is named identically throughout - it's the string for the gstreamer settings, i.e. "x-raw-int,rate=44100,channels=2 ! lame name=enc preset=1002 ! xingmux ! id3v2muxmp3".
The settings within Rhythmbox's properties for folder and file naming are all set to the sensible default. This is a pain. In the short term I'm going to try EasyTAG to sort it out, but ultimately I need to sort this or find alternative software.
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Apr 22, 2010
I cannot get package installer, either Synaptic, Ubuntu Center, sodo aptitude install or plain double clicking on .deb files I have already downloaded on my PC to work.I get this:dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.When I do(even after a clear)sudo dpkg --configure. Ubuntu goes and tries to mess up with my boot configuration. wtf does installing a package have to do with messing up my lilo? I get this regardless of how I try to install the package and it makes no sense(ok, If I do this graphically, I get the same errors from a widget window)
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Mar 23, 2010
I'm writing a wrapper for FFMPEG and need help of a multimedia guru. The more I read about containers, formats and codecs the more confused I become, it all seems to be a pretty big mess. To convert a video file with ffmpeg you need to specify a few arguments for ffmpeg:
- input file
- some video/audio options (bit rates, sizes and so on)
- format (to force format)
- codec (to force codec)
- output file
My confusion is all about the format and output file extension. If I want to encode my file in MPEG-4, I'll use either 'libx264' or 'libxvid' codec. Then the encoded stream needs to be stored in a file. If I use '.mp4' as the output file, it'll be stored in that file. If I use '.mkv', the video will still be MPEG-4 but stored in a Matroska container. But what do I do with the format option? When I force the format to 'mp4', does it mean I don't have to enter output file, it'll be stored as '.mp4' anyway? Or if I use '-matroska' will I still have to put it into a container '.mkv'? Can I use a '-matroska' format but '.mp4' output file for example?
What's the difference between the format and output file in this context? Or what does forcing the format really do?
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Feb 11, 2010
i have a problem. when i changed from xp to linux mint 8, my speakers seem to just give up on me after about 2 hours of use. the only way i can fix them is to restart the computer.
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Oct 5, 2010
The new NVIDIA drivers don't seem to work as seamlessly as back in Jaunty and before. In Lucid when I activated the drivers I had to do some grub tweaks to make my splash look normal... But with Maverick it is even more messed up...
Problem: The splash either doesn't appear at all (black screen) or it appears in the text format rather than graphics... In some instances it even hopelessly tried to load the graphics splash - loaded the background but the instead of Ubuntu logo and the progress-bar animation it displayed a "Ubuntu 10.10" in a monospace font.
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Jun 12, 2010
I have official Compiz Fusion running on my Fedora 13 64-bit. I also installed some custom cursor themes and I'm seeing some strange behaviour. When mouse is on my Desktop the custom cursor theme is replaced by the default one. When I launch Firefox, for example, and move cursor inside Firefox window, then my custom cursor is being shown. Also, if I go to resize some window the custom "resize cursor" is being shown, or if system is processing something then custom hourglass cursor is shown again.
Basically while on Desktop or Gnome panels the custom cursor is being replaced by the default Fedora cursor.
This only happens when I choose Compiz as my window manager. With metacity my custom cursor theme is behaving properly. Is it possible to make Compiz Fusion not to mess with my cursor theme? Or maybe it is a Compiz bug?
Ok, this indeed is a bug, but I'm not sure if it's a Gnome or Compiz bug. Here is a fix (a bad one for now) which might save someone time. The credit for this does not belong to me, I got it form this link. So, here it goes:
1. Install gconf-editor by running "yum -y install gconf-editor"
2. Change your windows manager to metacity temporarily
3. Change your cursor theme to the desired custom one
4. Run gconf-editor and go to "desktop->gnome->peripherals->mouse" and remember the value of "cursor theme" option this gconf-editor branch.
5. Create directory with name "default" in "/home/yourUserName/.icons/" directory.
6. Inside newly created "default" directory create file with name "index.theme" with the following content:
Code:
[Icon Theme]
Name = <anything you want>
Comment = <anything you want>
Example = <anything you want>
Inherits = <THEME NAME YOU FOUND IN STEP 4>
7. After saving the file re-enable Compiz as your window manager and logout/login to your account. The problem with this fix is that you will have to modify "index.theme" file every time you will want to change your icon theme, but it works nevertheless.
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Jun 13, 2010
OpenSuse 11.2
linux 2.6.31.12-0.2-desktop x86_64
ATI fglrx video driver v10.4
ATI radeon hd3200 video adapter
VirtualBox (any version) crashes at startup if the video acceleration options are enabled. This was not a problem before installing fglrx. The crash occurs when VirtualBox queries the video driver about OpenGL, I am guessing from the log file.
To (supposedly) have access to all of the features possible in the video adapter I installed the ATI fglrx video driver. I (apparently foolishly) chose the custom, installation-specific path rather than the more general default path.
After installing the driver I saw no observable improvement in performance or feature set. Worse, there are couple of new features that are decidedly undesirable, and cannot be disabled. At least one pre-loaded font simply disappeared.
So I reverted to the original (open source?) radeon driver ("sax2 -r -m 0=radeon" at runlevel 3). All seemed welluntil I ran VirtualBox.
One thing I have not tried is to run the fglrx default installation. I fear making things worse.
Can anyone suggest what might have happened with the fglrx installation, and how to fix it?
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Sep 10, 2011
On a Powerbook G4, I set hdparm to set the filesystem readahead (-a) to the maximum 2048 on boot. This produces a visible increase in performance... But today the hard drive started acting up - first generating I/O errors when trying to access various system binaries, and the second time bringing the desktop to a standstill and emitting loud clunking noises.In both cases the drive worked normally after a reboot... Even so, these are not what I'd consider good signs. However, the computer was working perfectly up until now, so I'm wondering if my tweaking was responsible. Can overly aggressive filesystem readahead settings damage an IDE hard drive?
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Jun 12, 2010
In a nutshell: sudoers is not designed to use 127.0.0.1
Old, broken sudoers:
Code:
New, fixed sudoers:
Code:
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Mar 25, 2011
I changed my user name, and now the Terminal shows my new user name.I log in with the same user name and the same password. But after changing the username, I can't get anything done as sudo. It says that I am not in the sudoers file, and I can't get in at all. I tried sudo visudo, sudo -i, sudo -l..When, I wrote sudo -l the following came in the Terminal.How do I get into sudoers file and give my new user name ariya the root privileges. Even my old user name doesn't work at all.
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May 28, 2010
I have accidentally deleted the contents of sudoers file (while trying to add a line through CLI).Anyway, I'm still logged in and can please someone paste me the default contents of the sudoers file on Lucid Lynx
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Jun 5, 2010
A few minutes ago I accepted a suggestion from update-manager for restarting my system, such that some security updates could be effective. After restarting and login in as usual, I discovered that I could not use my adminstrative rights as a sudoer. To recover them I booted again, as root, and added my username in the "admin" group. Rebooting, all seemed well again. As an extra check I installed and ran 'chkrootkit' and nothing suspect was found.What could have hapenned? Just a glitch in the system? Can a user disappear from a group for nothing?What further checks can I make to be sure that my system is safe?I'm using Ubuntu Jaunty Jakalope amd64, with kernell 2.6.28-15-generic.
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Feb 15, 2011
How do I add user xyz to sudoers?
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May 16, 2011
I want to create a group called scripts, add www-data to that group. I then want to edit the sudoers file and tell it that the script group doesn't need a password. Where should I put this line excatly in the sudoers file?
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