It appears that this command did the trick (took it from here:
https://askubuntu.com/questions/1171211/ubuntu-18-04-software-
properties-gtk-failing-with-org-freedesktop-dbus-error-ser).
sudo apt-get update && sudo apt-get install --reinstall python3-six
python3-certifi
Would be nice to have a
It appears that the actual issue does not relate to the "update-manager", but
more to the package "software-properties-gtk", which should start when clicking
“Settings & Livepatch”. I created a bu report accordingly here, provided I am
correct:
Public bug reported:
When trying to open software-properties-gtk via Terminal (via GUI:
“Settings & Livepatch”) the following error is returned in the terminal
and software-properties-gtk does not open.
ERROR:dbus.proxies:Introspect error on :1.121:/: dbus.exceptions.DBusException:
** Summary changed:
- ubuntu 20.4 update-manager “Settings & Livepatch” not starting
+ ubuntu 20.4. update-manager: “Settings & Livepatch” not starting and
returning error
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Public bug reported:
Bug:
ubuntu update-manager Updates work perfectly, but when trying to open “Settings
& Livepatch” the following error is returned in the terminal and “Settings &
Livepatch” does not open.
ERROR:dbus.proxies:Introspect error on :1.172:/: dbus.exceptions.DBusException:
Thanks. I can also confirm this bug running X2Go on Ubuntu 18.04 (Client /
Remote).
Appears to have been described also here:
https://lists.x2go.org/pipermail/x2go-dev/2019-December/013260.html
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