Ubuntu "Failed to restart polkitd.service: Unit polkitd.service not found."

Question

I've been trying to get hibernate working on a fresh install of Ubuntu 18.04 LTS.

It works beautifully using sudo pm-hibernate from command-line.

I followed instructions to give me a menu option by creating the file /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla

This created the menu option, but it was obviously doing something different, because upon re-power-up, the system starts fresh as if from a "hard" shutdown, whilst with pm-hibernate the system restores to exactly where I was at.

Through various efforts, I've now lost the menu option, although there remains an option for "Hibernate" under Settings->Power.

I was trying to get the menu option to use pm-hibernate instead of systemctl hibernate.

I think (but I'm not sure) that the problem came with sudo apt remove hibernate

I don't know how to get back the menu option, which appeared after creating the polkit file above. That file still exists and is unchanged.

So I tried: sudo systemctl restart polkitd.service which responded with:

Failed to restart polkitd.service: Unit polkitd.service not found.

Even though:

sudo apt install policykit-1

reports:

policykit-1 is already the newest version (0.105-20ubuntu0.18.04.1).

1. First I want to get polkit working again
2. As a separate question I'll then ask how to control which hibernate routine it uses (pm-hibernate or systemctl hibernate) because one of those works beautifully for me, and the other fails.

Answer 1

It's polkit.service, not polkitd.service.

[tom@archlinux ~]$ cat /usr/lib/systemd/system/polkit.service 
[Unit]
Description=Authorization Manager
Documentation=man:polkit(8)

[Service]
Type=dbus
BusName=org.freedesktop.PolicyKit1
ExecStart=/usr/lib/polkit-1/polkitd --no-debug
[tom@archlinux ~]$ 

Tip: You could have found out with dpkg -L policykit-1 | grep service or even the lists of files of a package on https://packages.ubuntu.com/.