Guys/gals, I thought I'd tell everybody that Acrobat doesn't play well with Slack -current and -12.0. To get around this, you need to edit /usr/bin/acroread: Change line 418 to read: echo $mfile| sed 's/libgtk-x11-([0-9]*).0.so.0.([0-9])000.([0-9]*)|(.*)/123/g'