Bug#829557: lightdm 1.18.2-1 breaks D-BUS

[Tsu Jan]

Today I encountered the same issue but in a worse way. After the first 
log-in, everything was OK. But once I logged out of LXQt and logged in 
again, not only PCManFM-Qt didn't start, but also it couldn't be started 
in terminal, the notification area didn't run, Pidgin crashed and 
Firefox said "No D-BUS daemon running". I think Firefox's message 
explains everything.

Downgrading to lightdm-1.18.1-1 fixed all issues.