I found this on the logs:
/var/log/syslog
Apr 22 09:48:13 laptop dbus-daemon[768]: Unknown username "nm-
openconnect" in message bus configuration file
$ grep -i nm /etc/passwd
nm-openvpn:x:123:131:NetworkManager
OpenVPN,,,:/var/lib/openvpn/chroot:/bin/false
nm-openconnect:x:122:130:NetworkMana
*** This bug is a duplicate of bug 1571300 ***
https://bugs.launchpad.net/bugs/1571300
I see this in /var/log/syslog
Apr 22 09:48:13 nacho-laptop dbus-daemon[768]: Unknown username "nm-
openconnect" in message bus configuration file
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The instructions written by Djalma B. Martins at
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
sis/+bug/301958/comments/38 worked for me.
That, the sisimedia driver, was the only one that worked. Others, like
the one in launchpadlibrarian, had interchanged the values for color
dep