Linux Tutorials & FAQs


Getting Started with RHEL

Ruby Crash Course


Frequently Asked Questions

I cannot log into Window Manager!

It is most likely that you are over quota. The Window Manager (Gnome or KDE) needs to create some temporary files when you log in, and it cannot. Please see this page for information regarding disk quotas:

You should be able to log in via ssh or change the session to something besides KDE or Gnome and delete some files.

I can log in, but none of the commands seem to work.

It may be that you have deleted your .bashrc or .bash_profile files. Ubuntu uses /etc/skel/.bashrc as the base .bashrc that gets copied into every new users home directory. Unless you have made custom changes, you can simply copy /etc/skel/.bashrc to your home directory. (Custom changes will need to be manually entered). We do not recommend using any shell besides bash.

After 9.5 hours of being logged in, the window manager stops working, or my home directory mount goes away.

This is a known problem and has to do with your Kerberos ticket expiring. There are a number of solutions including:

  • Issue a kinit command such as kinit username@AD.ENGR.UCONN.EDU at least every 9.5 hours
  • SSH to the machine which you are working on at least every 9.5 hours
  • Use longlogin, a ruby script designed to allow you to have arbitrarily long sessions without worrying about an expired Kerberos ticket. This script takes an argument which is -1 to run forever or a number of hours, for instance longlogin 40. This script does not run in the background, but occupies a terminal. If you want to run it in the background use GNU screen.

Other Resources

For more information, questions or comments about the ITEB C27 Lab or the ITEB C25 Lab, contact Howard Ellis at