Ubuntu :: Chmod And/or Update-related Boot?
Jan 29, 2011
I've had my share of troubles with Ubuntu before and always been able to find help just by reading the forums, but this time it doesn't seem to be happening. Basically, I think I did something stupid by trying to change the permissions on my home folder to 777. (I'm the only person who uses my computer and got sick of always having to get root permissions.) Halfway through the process, the computer slowed to a crawl and text in dialog boxes started getting replaced with empty squares.
Naturally I rebooted - or tried to. Regular boot didn't work, so I tried recovery mode, which was kind enough to tell me I had a kernel panic because sbin/init wasn't found. Here's where things got weird: I then tried to boot from my Ubuntu USB stick, and couldn't. I got to the USB menu, hit the "run" option, and after a few seconds of the Ubuntu boot screen, my monitor went blank. Actually, to be technical, it didn't just show a black screen - the screen shut off. That's as far as I've been able to get.
By the way, just before I tried what I'm now calling the chmod-of-death, I also had an update freeze in the middle. I am able to boot into Windows, and have checked my USB stick - all seems fine. Any thoughts on this? Worst case, I can reformat the partition and reinstall, but I'd rather not lose all that data.
UPDATE: Okay, so I *did* manage, after about ten more tries, to boot from the USB stick. I went in from there and changed all the permissions back to 755. Tried to boot in recovery again, and still getting the same sbin/init error - so I'm wondering now if it had more to do with the failed update than the permission change....
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Oct 31, 2010
Just when I thought I was getting my Ubuntu 10.04 system stabilized and really usable, the webcam magically stopped working. When I first installed 10.04, the webcam worked perfectly right out of the box. Tonight, I tried to start the video in a Skype conversation, and nothing. Video preferences in Skype showed no options for a camera. Rebooting the machine didn't help.
The one relevant thing I can think of that happened between the last time it worked and tonight is installing a number of updates. I'm not sure how to look up which packages were installed when -- I'm happy to run commands if someone can provide them.
Unfortunately, I don't remember how it was configured before. Since it was working, I didn't look at /dev to see where the camera shows up. At the moment, there is no /dev/video*. Clearly the system doesn't recognize that the camera is there, but it did before.. I don't recall device specifics. I looked online for a spec sheet that would say who is the webcam manufacturer, but I can only find the resolution. Tomorrow I have to boot into Windows to do some other work and I can get hardware info then.The machine is an MSI A6200 220US; the specs seem not to be available on MSI's website anymore.
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Oct 29, 2009
I did this several other similar servers here today without errors. I'm not quite sure what I'm getting hung up on here.
[root@devoratech yum.repos.d]# rpm -q centos-release
centos-release-5-3.el5.centos.1
[root@devoratech yum.repos.d]# yum repolist
[code]....
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Jul 17, 2010
I accidentally did a 'chmod +x foo' when i meant to do a 'chmod a+r foo'.
-rw-r--r-- 1 casper trad 53 Jul 17 22:41 filegore
-rw-r--r-- 1 casper trad 13 Jul 17 22:41 filelemme
-rw-r--r-- 1 casper trad 24 Jul 17 22:41 nix
[code]....
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Aug 30, 2011
I'm trying to make a particular file accessible on my computer ( /dev/uinput ) without having to use sudo or su - I've set up a wiimote to act as a remote for my media player, and it requires access to that file. When I use chmod, chgrp or chown to change the file's settings, it enables access to the file - however, when I reboot my PC, the settings get reset, and I have to change the access rights when I first use it again. I've tried using the following commands to make the changes (substituting my username/groupname as user and group below), as root:
[Code]....
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Mar 27, 2016
I've got this weird problem: when I reboot my Debian 8.3 server, I have to run through the crypto unlocking processes for my encrypted volumes a few times before I actually get to a login screen. The operation times out 85% of the time, leaving me to reboot and try over and over until the system is happy.
Here's my partitioning setup (manually partitioned at install):
/boot: 500 MB, EXT2, nodev, nosuid, noexec
/tmp: 2 GB, EXT2, AES-256/xts-plain64 with RANDOM KEY
swap: 2.5 GB, AES-256/xts-plain 64 with RANDOM KEY
/: 35 GB, EXT4, AES-256/xts-plain 64 with PASSPHRASE
/var: 35 GB, EXT4, AES-256/xts-plain 64 with PASSPHRASE
/home: 45 GB, EXT4, AES-256/xts-plain 64 with PASSPHRASE
Here's the output from journalctl -b -p 3:
Code: Select allDate and time | server name | systemd[1]: Timed out waiting for device dev-sda5.device
Date and time | server name | systemd[1]: Dependency failed for Cryptography Setup for sda5_crypt
Date and time | server name | systemd[1]: Dependency failed for Encrypted Volumes
Date and time | server name | systemd[1]: Dependency failed for dev-mapper-sda5_crypt.device
Date and time | server name | systemd[1]: Dependency failed for /tmp
[Code] ....
I had the same problem in previous builds where I chose Twofish instead of AES, and I was hoping that the timeouts would be fixed by switching to AES as my CPU has the AES instruction set. Obviously that didn't make a damn bit of difference.
What am I doing wrong, or what should I change in my setup? The encryption is a requirement. Could the problem be caused by something as stupid as using a RANDOM KEY instead of a PASSPHRASE on /tmp and swap?
Debian 8.3 as OS version.
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May 2, 2015
After some updates Jessie 8 my boot grub shows now 2 kernel versions to boot from.
3.16.0-4-amd64
3.16-3-amd64
- How do I know which one is the newest and if happy with it, how to remove the older one?
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Jul 9, 2011
Having some trouble with a new install of Ubuntu 11.04. I use it for work, so I do tend to run quite a few programs at a time. Namely Pidgin, Firefox, Thunderbird, Chrome, Osmo, LibreOffice Calc, Calculator and Text Editor. Sometimes I'll listen to music using VLC. Sometimes (and I can't figure out when), I will be suddenly logged out without warning. Just BAM, black screen then back to the login screen. I've lost work from this happening.
My only clue is that it hasn't happened when I was not running VLC, but then again it doesn't happen consistently while running VLC. Also, it happened today when I wasn't running VLC but was using Calibre (along with my usual programs). Maybe I'm doing too much at one time? Maybe it's the RAM? How do I view an error log about what happened?
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Feb 16, 2010
I am trying to add subdomains on ubuntu 9.10 desktop edition and and I am not sure whether I need to add some info.(such as 127.0.0.1 sub1.example.com and so on) to the /etc/hosts file like the windows' windows/system32/drivers/etc/hosts file. I used to use the wamp-server(on Windows 7), I needed to edit 3 files, httpd.conf, httpd-vhosts.conf and hosts. And almost every edit is made in the httpd-vhosts.conf file on wamp-serveriles should be edited? or what else should be done that I didn't mention?
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Sep 17, 2010
I installed Mono 2.4 and I am struggling myself to remove all folders related to mono.. I didn't install from Synaptic so it's not just 'apt-get autoremove mono', I used the tarball.. how to remove all files from the installation?
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Aug 13, 2011
Somehow I lost the clock in the panel; maybe I uninstalled some packages related to the clock.
Anyone know which package I should install?
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Dec 11, 2010
Well I did something really stupid:sudo chmod 700 -R /Why? because it's late and I'm tired and somehow thought it was only on my current dir...Is this somehow fixable? I don't get my usual loginscreen so I guess through an tty?
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Apr 26, 2010
I am migrating my server from Kloxo (lxadmin) to Ubuntu (webmin/virtualmin), and I already had my Nameservers on my register (Godaddy) to go to [URL] and [URL] along with my IP. (I set the ttl to 60 cuz I thought that might be a problem) Now, I do a dig [URL], it gives me this output.
Code:
; <<>> DiG 9.6.1-P2 <<>> thedomz.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40276
[code]...
I can go to my website only when I change my hosts file (on my windows machine).
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May 20, 2011
I am new in Linux and Ubuntu. I am using Acer Aspire 4740 laptop. How can i find related drivers for my laptop?
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Mar 7, 2010
I just finished setting up my home ubuntu home server. Installed LAMP and it works beautifully. The problem is everytime I upload a file through FTP into the server, the file changes permission even though I did chmod -R 755 www. Si everytime I upload a file to my server i need to run the command chmod -R 755 /var/www
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Apr 11, 2010
or at least, it doesn't seem to. for some reason, my .txt, .doc, .rtf, and other files that shouldn't have the execute bit set often seem to (i think i know why, but that's not important). it's my understanding that this command should, for example, remove the execute bit from all .rtf files recursively (that is, from .rtf files in subdirectories too):
Code: chmod -R 666 *.rtf i've read help and the man page for chmod, and it seems that -R switch should make chmod work recursively, but it only alters files in the present working directory. could someone point out what i'm doing wrong?
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Dec 10, 2010
I have installed php, mysql, and apatche. And i need the /var/www/ folder to be able to be read witten, and acsessed by anything. I have tried chmodding 777. But it still doesnt work.
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Jan 12, 2011
it seems to me I can't get chmod to function recursively. I have a folder with a couple subdirectories in it and a few in each of those etc. Now, I want to give everyone read-write on all .c files. So, I typed in terminal:
Code: chmod -R 666 *.c However, none of the .c files in any of the subdirectories were touched, i.e. I could have accomplished exactly the same thing by typing
Code: chmod 666 *.c I did RTFM, and it seems that what I did initially should have been the ticket. What am I doing wrong?
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Mar 20, 2011
I have been working closely to the Katana boot kit here recently, and this is bugging me. I am trying to use a new program to Katana called Forge. I have it on my flash drive, and I open the properties to make it executable, and when I click something it automatically changes back. I have tried the basic stuff, sudo nautilus.
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Jun 18, 2011
I have spent the last 2 hours trying to get this to work and it is driving me crazy, I have a 11.04 box and have setup some zfs filesystems for data storage, I have 2 users and have created a group called media and added both of the users to the group. I have changed the group of the directory to media and have set chmod g+s
root@saturn:/tank/data# ls -l
total 8
drwxrws--- 2 root media 2 2011-06-18 13:59 Backups
drwxrws--- 2 root media 2 2011-06-18 14:26 Music
drwxrws--- 2 root media 2 2011-06-18 12:44 Pictures
[Code]...
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Jun 20, 2011
I'm having problems with chmodding a NTFS directory. I'm having problems accessing the directory through samba because of some missing permissions, but when I try to set them, nothing happens.This is what I do:
Code:
root@proliant:/media# ls -l
total 32[code].....
I also tried to replace 'hdd.1' with '/media/hdd.1' and 'hdd.1/'
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Dec 19, 2009
I have an external fat32 hard drive. It already has some files on it. Now, I mounted it and it shows the owner to be root. fine. but when I change the permissions, it does not seem to change it. I am not able able to access the directories, even as root !.I was able to create directories, but "luckybackup" wan not able to write to it due to permissions. I take it the lucky backup is executing as root/ but even otherwise, if I do chmod ugo+rwx, why do the permissions dont change ? (no erorr message by chmod).
here is the stuff: (ext drive mounted at /seagate)
rootubuntu--seagate# chmod ugo+rwx *
rootubuntu--seagate# ls -l
total 128
drwxr-xr-x 10 root root 32768 2008-08-11 21:03 HPComputerKeyFolders
drwxr-xr-x 9 root root 32768 2008-08-11 21:02 Other
drwxr-xr-x 2 root root 32768 2007-04-06 18:27 Recycled
code....
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Sep 4, 2011
I am trying to compile splasutis in my debian wheezy. ./configure run well, but during make I get the following error
make --silent all-recursive
Making all in libs
CONF libjpeg.a
[code]....
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Aug 30, 2010
I'm trying to sed out X and Y coordinates from a identify command. I get back from the identify:
Quote:
1015x638+0+0
I need:
Quote:
1015x638
[Code]...
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Apr 16, 2011
I've seen packets coming to my computer through a DD-WRTv24s2 gateway above port 32K several times. I have iptables (using fwbuilder locally) both places. My desktop stops the packets. But I'm guessing the problem is as I described in the title for this post. Yes?If you ESTABLISH a connection to some webpage, and you just accept ESTABLISHED or RELATED datagrams in rule 1 of your iptables, what will keep incoming TCP from that (presumably nefarious) site from going straight to your desktop like the building firewall isn't there?? If the site wants to connect to you above 32k, or portscan you, its RELATED correct? They know your IP. You've ESTABLISHED a connection.If my guess is correct, it would seem wiser to NEVER use these together. Better to ACCEPT all ESTABLISHED. And if something is RELATED, then ACCEPT it only if its the data connection on FTP or individually by service or protocol.
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Nov 22, 2010
Trying to debug a network issue - we have problems with scp transfers to a remote host intermittently stalling. I believe it may have something to do with incorrect handling of sack / dsack TCP options. Looking at netstat -s, during a (successful) scp transfer the TCPSACKDiscard and TCPDSACKIgnoredNoUndo counters increase rapidly. This is on the client initiating the transfer to the remote server. This doesn't seem normal, but I'm having difficulty finding an explanation of what exactly these counters signify. The tcp_sack / tcp_dsack / tcp_fack options are enabled in the kernel on both hosts.
How do I debug this further? Are the counters a symptom of a known problem? It's kind of hard to google this, all I get is unrelated netstat output which happens to include 1 or 2 discarded SACKs, not tens of thousands like I am seeing. I can make tcpdumps on the client (unfortunately not the server), but what should I look for?
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May 7, 2010
I want some users should be barred from login into some of NIS clients. Please help me to accomplish this. I googled it but still not very clear to me. Can you please tell me how it works. The OS is RHEL 5.
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Apr 20, 2010
I am using KMS with a radeon 3650, KMS with kernel 2.6.33.2, xf86-video-ati 6.13.0 and mesa 7.7I am using fluxbox, and only have one transparent terminal running. I have not been playing any games(so no 3d acceleration?).My computer is getting far too hot from this. Not overheating to the point it shuts down, but the fan is going full bore, and mplayer stutters when playing a movie.This never happened when I was not using KMS, so it seems likely that that is the cause. It is definitely related to graphics, because when I exit X the temperature cools rapidly.Is this just because KMS is new and still being worked out, or is it something that can possibly be fixed?
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Feb 16, 2010
I am doing a project related to system restore concept in linux. There i am planning to perform application wise rollback in case of failure!! Is there any way to figure out what are all the files used by an application in the system??
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Jul 20, 2010
i have recently been having random problems with mostly firefox. the 2 most annoying problems (that work in other browsers) were: no sound on various sites, like videos and amazon mp3 previews. the mailto command would not work.
the fix is 2 part: i installed the standard release of thunderbird 3.1.1 and the firefox mailto problem is fixed. i installed the standard release of firefox 3.6.7 and sound now works fine.
additionally i have removed thunderbird, firefox and related ubuntu brandng from the package manager for the following reasons:above fixes, time and frustration involved in debug.eliminates the chronic application directory rename during updates, /usr/lib/... and softlink change in /usr/bin.allows me to keep up with t'bird and firefox security patches as they are released, i.e. immmediately.
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