(Reading database ... 224866 files and directories currently installed.)
Preparing to unpack .../chimerax-rc.deb ...
Deregister desktop menu and associated mime types
Remove Python cache files
Unpacking ucsf-chimerax (1.0+rc2020.05.22) over (1.0+rc2020.05.21) ...
Setting up ucsf-chimerax (1.0+rc2020.05.22) ...
Install desktop menu and associated mime types
linux xdg-install system true
Unknown command: linux xdg-install system true
dpkg: error processing package ucsf-chimerax (--install):
 installed ucsf-chimerax package post-installation script subprocess returned error exit status 1
Processing triggers for man-db (2.9.1-1) ...
Errors were encountered while processing:
 ucsf-chimerax
