Ubuntu :: System Freezes After Log Off With Multiple Users Logged In
Oct 16, 2010
On Ubuntu 10.04 when there are more than just one user logged in, if one of users logs off system hangs with a black screen.
After I reboot the machine and log in again, just after GDM login screen I get a window with a message about PowerMeter crash, with suggestion to 'cancel' and 'log off'. Only 'Log off' works, i.e. I'm successfully logged in.
Last entries from system.log before system freeze are:
Code:
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Feb 21, 2011
I want to count the number of users who have logged in multiple terminals ? How will I get this ? I always get the total number of users. How will I get the uniq number of users with multiple logins ?
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Apr 27, 2010
Which commands do you use to output the current users logged into the system and accessing a specific file?
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Feb 27, 2011
logging in a server through putty in the same network when i executed last command its showing system ip logged in time and logged out time the output as followsthis is my system
oot pts1 xx.xx.xx day month date time in time out timeand similarly am geeting other than this likeroot :0day month date time still logged in this is from more than 3 days its logged in
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Jan 22, 2010
Is there any gnome tool out there that will allow admins to talk with logged in users? Without it being amsn, skype, or gtalk... I'm looking for something like the 'talk' command but GUI based.
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Feb 16, 2010
Whenever I want to shut down, I have to enter my password, because shutting down while other users are logged in is a privileged operation. Now, I couldn't download an update because the update lock was in use. I'd be surprised if someone had targeted my system, especially because I didn't install any obscure .debs or anything recently, but I'd really like to find out if it's been compromised somehow. Say, by obtaining an overview of all users currently logged into my system or something. Is that possible?
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Sep 30, 2010
Just wondering is there a command that would show me the details of whose currently logged on and how their logged on i.e. ssh/samba etc?
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Apr 6, 2010
I installed a few media servers to stream something to my PS3 over the weekend, but now when trying to shutdown the computer, I'm asked to authenticate with a password since other users are still logged in. I installed quite a few programs over the weekend trying to get it to work, so I can't remove a specific one. Is there a way to see which daemons are logged in under a different session? Found it. It turned out to be mythtv.
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Mar 17, 2011
I have 2 servers, web server & mail server. they show 2 users in the summary area when I run w or top commands. But the actual list of users logged in (using either w or who) shows only 1 user.
ps -ef |grep username only shows my current login as a running sshd process.
So I can find no trace of this other user except in the summary line for w or top. I have no shells or other logins left running elsewhere or abruptly terminated, no gui sessions (these are servers), no tty logins. Do I have another user logged in? Has someone hacked me & covered up most of their trail? Why do these commands show 2 users when everything else points to 1 user?
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Apr 12, 2011
I read the log
Code:
I found this print out:
Code:
The line in bold is the security issue. There is only 1 user account on the system. There should only be 1 user logged in, not 2 users logged in. The remainder of the log file lists 1 user logged in, for similar log output. 2 users logged in does not appear again in the log file.
Does the second line of bold indicate that an attempt was made to log in to the system using SSH?
There was an internet connection interruption (no service) around the time of the log file event. The service did return, later.
Does that line indicate that an unauthorized user logged in to the system?
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Aug 9, 2011
I run a linux file server for my office and we user SFTP for remote partners to login and download files. Is there a way to see if there are any active connections or logins so I can know when it is safe to perform maintenance on the machine?
Since the machine is almost constantly serving large files, scheduled maintenance is often bumped off due to someone either upload
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Nov 1, 2010
I try to write a script which would kill processes of users who are not logged in. My approach is to find out what users are logged in and then kill processes of all nonsystem users who fail the test of being logged. I use `w` for finding all logged in users, but apparently there are users on the list which `w` gives me who own absolutely no process in the output of `ps aux`. How do I log off those users, since killing their processes wont work (since they own no processes)?
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Dec 30, 2010
If there is a simple way to prevent accidental shutdown when the following situation occurs:
Sometimes, I log in on my father's computer to run some administrations' tasks (updates...). For that, I use SSH since I'm frequently far from my parents and what I want is to prevent a shutdown run by my father. Of course, he should be able to turn off by himself if nobody else is connected.
Molly-Guard allows to prevent distant shutdown, my request is a kind of complementary software.
Does anyone know a project which could fit with this request? Do you have simple ideas to write a short code I know bash, perl, python...
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Oct 25, 2010
Just noticed this, when I am logged into OpenSuse 11.3 under my default user (autologin) I have 3 of the same user logged in, eg when I run top it shows 3 users and when I run the users command it shows the same user 3 times. Is there any reason for this? Do I need to investigate this at all?
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Apr 21, 2011
When I'm logged into my account, I can't shut down the computer if someone else is also logged in unless I supply the root password. However, if I log out, I can shut down from GDM without being challenged, even though another person is logged in, which could cause problems if that person is in the middle of some work. Is there a way to password-protect the gdm shutdown function if people are logged in?
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Aug 27, 2010
I can't seem to get last logged in dat/time for vsftpd users. They are linux users maintained within passwd groups ect ... i think this is because ftp doesn't actually give them a real session. That being true, how do i get the last logged in time for my ftp users?
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Jun 7, 2010
I need to figure out a bash command to list all users logged in at or after 5pm - 5pm being the specifier in the command.
Code:
Command seems to be the easiest way to display users but it specifies all users log times.
I've also fiddled with the lastlog command to no avail.
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Jul 17, 2010
It is possible to check who logged in with "who" command. If we are also logged in to that linux pc.
But, is there any possibility to check without our login?(not even by ssh)
Our logging in to find that pc, will be wasting the cpu resources. And may disturb the user who is working on the x-session.
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Nov 12, 2010
Have recently setup Samba on a fresh install of Fedora 14 so that I can use it as a workstation in a Windows 2003 (win2k3) domain.
The install of Samba seems to have worked as I can connect to the Domain using ADS and kerberos. selinux and firewall have been disabled until I have it working 100%
The problem lies when i try to login to Gnome or TTY. It begins to create the home directory for the domain user logging in but after a certain process Fedora logs the user out of the system.
Have looked through several log files (/var/log/messages, log.winbindd, log.winbindd-dc-connect) but am unable to debug it any further.
Have posted the config files below which shows the Fedora machine is successfully connected to the domain as it lists its groups, users and validates logon credentials - it just won't logon!
Where i can go about debugging. Also if you need additional configs.
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Jun 28, 2009
script which can add a secondary group to all existing users except system users in linux.
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Apr 1, 2010
I have some simple practical requirement to receive a mail if someone logged to my system.
I think we can see who are logged into our system using the command who or finger or w.
But I want to get a mail as soon as a guy logged into my system.
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Aug 3, 2010
I have been experiencing issues when switching users since my last update; I filed a bug, but I was interested if anybody else was having the same problem:URL...In a nutshell the computer freezes temporarily during the switch user process. The longer it is running, the longer the freeze lasts. When frozen the screen is black except for a mouse pointer; but the mouse and keyboard are not responsive including the usual X command keys (Ctrl-Alt-Del, Ctrl-Alt-Bksp, Ctrl-Alt-F1, etc.).When I get the chance I am going to rollback gdm to see if that makes a difference.
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Nov 6, 2010
I've used linux systems before, but the last time I actually set up a server was when fedora core 4 came out, which was, to say the least, quite a while ago. here's my core dilemma: atm, I have fedora 13 set up, and i'm looking to be able to vnc into it WITHOUT already having logged on as a user. I've tried various things and I'm having little to no luck. I uninstalled tigervnc and installed the original vnc package (With server) from realvnc.com. I've also installed xinetd and tried to get it to incorporate vncserver as a startup service, to no avail.
I have not been able to connect to the vncserver regardless of how I try. I AM able to connect to the base remote desktop functionality provided by fedora (Also vnc based). However, as soon as I disable that, I am not able to vnc into it at all. Long story short, here are the current goals:
1) be able to vnc into the computer without having logged into the system physically
2) have those logins be un / passworded. i.e., be able to login as whatever user
3) complete disable the normal graphical startup that fedora provides, since I don't think there's ever going to be a person physically at the computer and I'd like to maximize system resources
Also, if VNC is NOT the easiest way to do something like this, please let me know, I'm completely amenable to taking another route. In short, I'd like non-physical per-user graphical access to the server. I'd also like it to be more than one single vnc session, as I may have it open from either multiple locations or multiple users.
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Jul 12, 2010
How can I (as admin) find out when a certain user e.g. "karl" most recently logged in and most recently logged out of a system?
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Oct 12, 2010
[Staff Note: This thread was spun off from here: HOWTO: Purge and Reinstall Grub 2 from the Live CD This solved the Grub problem but the crashes continue.]
Just as I get up and running again my 10.04 (64 bit) either freezes up totally, closes all windows that are open, fails to restart or shut down forcing a restart.
There's no pattern to it, i might be using the gimp or checking thunderbird emails, possibly just surfing or running bluefish. Nothing major and I'm not one to go delving under the bonnet so to speak and start tweaking things. I have the AWN dock installed and run a dual monitor setup.
Everytime it's crashed, the damn thing doesn't reboot, I get the init =bootarg message I've been reading a lot about and once again I have to run the liveCD and spend several minutes farting about purging and reinstalling grub.
I despise Windows, overall I am enjoying my ubuntu experience but things like this stop me getting any work done.
My PC ran fine for the last 2 days then suddenly it's playing up again. It's not an old machine, quad core processor, plenty of RAM.
I am having to back stuff up as soon as I do it due to so many crashes per day. I have reinstalled the OS and started again from scratch 4 times now in the last month.
The last thing I want to do is go back to Windoze but I am seriously running out of patience with ubuntu.
Boot Info Script Results:
Code:
# Boot Info Script 0.55 dated February 15th, 2010
============================= Boot Info Summary: ==============================
=> Grub 2 is installed in the MBR of /dev/sda and looks on the same drive in
partition #1 for /boot/grub.
code....
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Apr 25, 2010
I had Ubuntu 9.10 running ok, but I've decided to try Lucid Lynx with Kubuntu and was quite impressed with the quality of KDE. Everything worked out of the box also.Until I tried to login with two other accounts this computer had...With one of the users I get both errors seen on the snapshot. One regarding the network manager (which I think it was given just because it was already started by another user), and the ibus error, which completely locks the user from accessing any other drive or usb disk.For the third user, even if creating it from scratch (not re-using his /home), I get an error:
Code:
kstartupconfig4 does not exist or fails. The error code is 3. Check your installation.
/home is in another partition that's been used since 7.10 I think. I did cancel all /. from
[code]...
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Oct 31, 2010
Let's suppose that a machine has three users:
(1) david
(2) dan
(3) joel
The computer now restarts and during the log-in process, I choose to login into dan's account.
At this point, when I am logged in into dan's account, will Ubuntu run the crontab jobs that belong to david / joel?
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Mar 4, 2010
How to add something to start when you are logged in (System -> Preferences -> Startup Applications), but I want to know, where this parameters stored.
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Sep 22, 2009
I'm still having trouble with the computer freezing if I try to close Mozilla-Firefox with multiple tabs open. (and I often forget to close them individually)Is there a solution to this?
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Feb 3, 2010
Ok, for various (mostly security) reasons I was experimenting in running certain apps as a different user id (on Karmic).
I can get X to forward to my main session without a problem but I cannot get the sound to work. Sound works fine in my main session, but when I run sound as another user I get plenty of errors like:
PHP Code:
ALSA lib pcm_dmix.c:1008:(snd_pcm_dmix_open) unable to open slave
I am not a big linux GUI person, so I have rarely dealt with sound systems under Linux. What is the simplest way to get this to work in a relatively secure way? (I do realize that my security is already a bit compromised by allowing the secondary user access to X, but that can't be helped)
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