Confirmed, this is affecting firefox only on trusty.
The Flash plugin works as expected on xenial, bionic, cosmic, disco.
wl_surface_interface is a Wayland symbol.
As stated in comment #1, Ubuntu 14.04 is approaching end of life, which
makes the priority of this bug and its likeliness to be fixed
Same in "66.0.1+build1-0ubuntu0.14.04.1":
/usr/lib/firefox/plugin-container: symbol lookup error:
/usr/lib/firefox/libxul.so: undefined symbol: wl_surface_interface
[Parent 6345, Gecko_IOThread] WARNING: pipe error (137): Connection reset by
peer: file
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: firefox (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1814465
Title:
The same error message appears in the shell (different pipe error) when
running a local flash (.swf) that always worked before the recent
firefox 65 that was pushed to ubuntu 14.04 LTS systems. Sure 14.04 LTS
and flash are approching end of support so the number of users affected
may not be large
