Today, after an `apt upgrade' that brought me an updated grub, the
problem came back. I logged on the second virtual console, edited
/etc/default/grub, and found a new instance of the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
I commented it out, typed `sudo update-grub`, then `sudo reboot', and
everything seems fine again.
Why did this line ever come back after I removed it? I grepped my way
around the system files in search for an answer and found a likely
culprit to be `/var/lib/dpkg/info/grub-pc.postinst'. I don't quite
understand what this post-installation script does, but it kind of looks
like it is putting into /etc/default/grub some settings that come from
debconf.
I then ran `sudo dpkg-reconfigure grub-pc' and, when prompted from
the default Linux command line, the text field was pre-filled with
"quiet splash". I emptied it and left the other settings untouched.
Now, my /etc/default/grub contains the line:
GRUB_CMDLINE_LINUX_DEFAULT=""
I hope the fix is definitive now. We'll see on the next upgrade of the
grub packages.
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https://bugs.launchpad.net/bugs/1845801
Title:
[nvidia] Automatic login fails and then all subsequent logins fail.
Killing gnome-session-binary fixes it, or just not using automatic
login.
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