When I type in my password to my newly installed Ubuntu 14.04 computer, it returns me to the login screen. I've seen other answers but those were to Ubuntu 13.04 and older and didn't work.
I had same issue i was setting up oracle and messed up with
PATH variable, with this i could not get past the login screen. Thing that solved my issue was that, in
.bashrc, I accidentally did not append
This worked for me, if this is the case it should work for you too.
Look at here: Can't login to Ubuntu 14.04 after upgrade maybe can help you.
$HOMEpermission and owner,
chown $USER:$USER -R $HOME; chmod +x -R $HOME, or try to use a Guest Session, or try
adduserto create a user then login.
Try reinstall Ubuntu Desktop,
sudo apt-get install --reinstall ubuntu-desktop ubuntu-session.
If all above can't work, maybe the lightdm is break, try to fix
sudo apt-get install lightdm --reinstall.
Or, just try to use kdm & Kde desktop:
sudo apt-get install kubuntu-desktop kde-standard. (。・_・。)
I had similar issue on fresh 18.04 install. Safemode worked well, normal mode kept kicking me out after logging in. UI also lagged during animations, so it was clear that was a graphics issue. So I just updated my Nvidia drivers and it worked.
sudo add-apt-repository ppa:graphics-drivers sudo apt-get update sudo apt-get install nvidia-390
Do experience any graphical glitches?
This might be the result of Unity not beeing able to start due to a problem with getting 3D acceleration - so your graphics-card driver is in question (thanks for nothing compiz).
Do you happen to know which graphics card you are using? When in doubt you can press CTRL+ALT+F1, login, type:
lspic | grep VGA
usually you ll get something like
you@yourPc:~$ lspci | grep VGA 01:00.0 VGA compatible controller: NVIDIA Corporation GK110B [GeForce GTX 780 Ti] (rev a1)
You'll then have to update your graphics-card driver, which either might be:
sudo apt-get install fglrx
sudo apt-get install nvidia-current
Intel cards usualy don't cause problems.
If this all did not help you might consider booting an older kernel from GRUB, if any is installed. (you can return to your graphical enviroment by pressing CTRL+ALT+F7)
I had same problem with Ubuntu 18.10 and following method help me:
At the login screen use Alt+Ctrl+F3 to access the command line login method.
Log in to the shell with your username and password.
Uninstall and reinstall Ubuntu lightdm. Run the following (be sure to connect to the network):
sudo apt-get purge lightdm sudo apt-get install lightdm dpkg-reconfigure lightdm
Once reconfigured, now reboot.
In version 18 it asks for a new password for user ubuntu which I entered. I used 4-l's for my password for user ubuntu. Ubuntu wil not accept the old password or the 4-l's. Based upon the fact that I cannot login to ubuntu I will move on to another os. I like to buy my haay before it goes through the bull. My recommendation for version 18 users is wuuit ehile you are ahead.