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.
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