Actually, Daniel, your mention of "upgrading" to LXQt has me wondering
whether or not you took an LXDE version and then upgraded to an LXQt
version(unsupported by Lubuntu, officially) without cleaning up all the
old LXDE/GTK stuff. This could certainly lead to you using pcmanfm
rather than pcmanfm-qt or otherwise using some app or apps that use
GTK2, which everything seems to point to being the problem. LXQt doesn't
use GTK-anything, so it should entirely be a non-issue.

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https://bugs.launchpad.net/bugs/1782984

Title:
  PCManFM freezes with Assertion `!xcb_xlib_threads_sequence_lost'
  failed when clicking on a file or folder in 18.04

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