libMonoPosixHelper is missing.
Try: sudo apt-get install libmono-posix2.0-cil
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Can't start Do after latest upgrade of Mono packages
https://bugs.launchpad.net/bugs/398678
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ubuntu-bugs
The same problem, dmesg from my laptop (Toshiba with Radeon Xpress):
[ 2195.083216] [drm] GPU reset succeed (RBBM_STATUS=0x0140)
[ 2195.083221] [drm:radeon_fence_wait] *ERROR* fence(ea487bc0:0x04D3)
55472ms timeout
[ 2195.086122] [drm:radeon_fence_wait] *ERROR* last signaled fence(0x0