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I have a machine (let's name it my-machine), which runs Ubuntu 16.04.

my-machine is connected to LDAP, and I use an LDAP account to login to it. With my LDAP account, I use exclusively this machine.

However, today, I used my LDAP account to connect to another machine (let's call it second-machine), which runs Kubuntu.

After that, I am not able to login to my-machine anymore. The graphical user prompt prints error message Failed to start session.

However, when I switch to console, using ctrl + alt + F1, I still am able to login successfully.

Now, when listening to file /var/log/lightdm/lightdm.log in console, during a graphical login, here are the logs I see:

DEBUG: Authenticate result for user myuser: Success
DEBUG: User myuser authorized
DEBUG: Greeter requests default session
DEBUG: Seat seat0: Failed to find session configuration default
DEBUG: Seat seat0: Can't find session 'default'

Question

Why am I not anymore able to GUI-login on my Ubuntu machine?

How can I fix the problem?

Elouan Keryell-Even
  • 180

1 Answers1

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Answering my own question

It turns out logging into the Kubuntu machine added/modified a ~/.dmrc file in my LDAP home folder, with the following content:

[Desktop]
Session=default

This is where the Can't find session 'default' log line comes from. Indeed, when taking a look at /usr/share/xsessions (as hinted in this post), the only file I find is

/usr/share/xsessions/ubuntu.desktop

Session default does not seem to exist.

Modifying ~/.dmrc to Session=ubuntu fixed the GUI-login.

Elouan Keryell-Even
  • 180