This is a weird issue as sometimes when upgrading or even migrating, this could happen and the reason is simple but maybe not 100% obvious at first. 

You will find that your GUI doesn't load and most services fail to start, even logind

Here are some errors you may see:


Mar 13 22:22:23 rttbox systemd-logind[2892]: Failed to connect to system bus: No such file or directory
Mar 13 22:22:23 rttbox systemd-logind[2892]: Failed to fully start up daemon: No such file or directory
Mar 13 22:22:24 rttbox systemd-logind[3795]: Failed to connect to system bus: No such file or directory

Mar 13 22:22:47 rttbox dbus-daemon[2282]: [system] Failed to activate service 'org.freedesktop.ColorManager': timed out (service_start_timeout=25000ms)
Mar 13 22:22:47 rttbox dbus-daemon[2282]: [system] Failed to activate service 'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms)
Mar 13 22:22:47 rttbox dbus-daemon[2282]: [system] Failed to activate service 'org.freedesktop.PolicyKit1': timed out (service_start_timeout=25000ms)
Mar 13 22:22:48 rttbox dbus-daemon[2282]: [system] Failed to activate service

The easiest way to know if this is your cause is to check /var/run:

ls -al /var/run
lrwxrwxrwx 1 root root 4 Jul  2  2019 /var/run -> /run


/var/run should be a symlink to /run, if it's not then you'll need to fix it like this:

First we copy any relevant contents of /var/run into /run, then we delete /var/run and resymlink it to /run as it should be.

cp -a /var/run/* /run/
rm -rf /var/run
ln -s /run /var/run

Now make /run/dbus in case it's not there and restart the dbus service:

mkdir /run/dbus
systemctl restart dbus

After this everything should be OK, you may need to reboot if it's still not.

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