The Ubuntu 18.04 LTS installation (with 4.15.0-24-generic x86_64) in our living room fails to boot to the login screen. Some other Ubuntu installations in our flat are still working alright (they should be on the same patch level). I used the borked one this morning and it was working okay. Afaik no updates or anything. Normal shutdown around lunch. When I tried to boot it again a couple hours later, it keeps hanging.
After power up, it first hangs a while on the screen with the logo and the dots (no dots move, only the first one is ever shown). After about half a minute or so, it drops to the boot messsages; here is what's shown last:
[ OK ] Started GNOME Display Manager.erver.tcher Service......tem changes.pp link was shut down....
After that, nothing.
I can Ctrl+Alt+F2 to a tty login. I can then log in, ping Google, use apt, etc. I updated everything and rebooted, but it didn't change anything. Reinstalled gdm3 and GNOME, still nothing.
Any hints?
Have a look at this link: https://www.linuxuprising.com/2018/07/ubuntu-1804-linux-kernel-update-causes.html
Kernel image 4.15.0-24 is said to have caused this issue on some systems.
A patch is said to be available. However, the new kernel image package is not yet available in the 'updates' repo. It's still in 'proposed'.
What also helped for me is installing haveged (user space entropy gathering daemon).
I have two PCs with the same hardware that refused to boot. On the first one, I installed the proposed kernel. On the second one, I just installed haveged. Both solutions solved the boot issue.
See this bug report on Launchpad for reference: https://bugs.launchpad.net/ubuntu/+bug/1779827
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