Newly (possibly after a kernel update) I get the following message during boot:
Failed to start d-bus system message bus
Several services fail afterwards (e.g. network). My display manager does not come up, after the bootup needs much longer than usual. But, from the console I see that d-bus is running at the end and even running
startx starts Gnome as usual with everything working.
The error is reproducible, after selecting old kernels in the boot manager, it worked once per kernel as usual, but never again afterwards.
I would appreciate any ideas on this. Thanks!