Running Xubuntu 18.04 LTS, I've set up hibernation with
uswsusp, and it works flawlessly (
Then, I've integrated
s2disk to Systemd (
systemctl hibernate) by overriding the
systemd-hibernate service to
[Service] ExecStart= ExecStartPre=-/bin/run-parts -v -a pre /usr/lib/systemd/system-sleep ExecStart=/usr/sbin/s2disk ExecStartPost=-/bin/run-parts -v --reverse -a post /usr/lib/systemd/system-sleep
sudo systemctl hibernate works without any issues.
The problem appears when clicking the hibernate button on the power menu (enabled via polkit) fails - it looks like it worked, but when resuming the system freezes completely upon login.
I suspect that the button does not actually run the same commands as the other methods, but I couldn't find how to set it.
Update: This seems to be machine-specific. I have another PC, with very similar setup (same Xubuntu version and hibernation configuration - from here). On the other PC, it works correctly, but for the machine in question (it's a laptop), it still does not.
Update 2: I've tried to restart Plymouth upon resume (this is a solution to similar issues I've found), but it didn't help.