Removing a kernel crashes my system.

[cedws]

When I try to remove the latest installed kernel, my system (running on Ubuntu 18.04) sort of... crashes. The screen goes black, and after a few seconds, I am taken back to the lockscreen to login.

Not really sure what diagnostic information I can give here. The kernel I am trying to remove is 4.17.0-rc7, but I'm running my system on 4.17.0-rc2 at the moment as the installation partially fails.

[Huluti]

Same problem here...

[Huluti]

Seems to be a problem with Wayland

[Huluti]

Here's more logs (from /var/log/auth.log):

Aug  4 13:12:52 hugo-Ubuntu polkit-agent-helper-1[9406]: pam_unix(polkit-1:auth): conversation failed
Aug  4 13:12:52 hugo-Ubuntu polkit-agent-helper-1[9406]: pam_unix(polkit-1:auth): auth could not identify password for [hugo]
Aug  4 13:12:52 hugo-Ubuntu polkitd(authority=local): Unregistered Authentication Agent for unix-session:2 (system bus name :1.80, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale fr_FR.UTF-8) (disconnected from bus)
Aug  4 13:12:52 hugo-Ubuntu polkitd(authority=local): Operator of unix-session:2 FAILED to authenticate to gain authorization for action org.freedesktop.policykit.exec for unix-process:9401:267918 [<unknown>] (owned by unix-user:hugo)
Aug  4 13:12:52 hugo-Ubuntu gdm-password]: pam_unix(gdm-password:session): session closed for user hugo
Aug  4 13:12:56 hugo-Ubuntu systemd-logind[872]: Removed session 2.
Aug  4 13:12:56 hugo-Ubuntu systemd: pam_unix(systemd-user:session): session closed for user hugo

So, seems to be a problem with Wayland and Polkit...