When I click on it to open, nothing happens. Read up some documentation on Signal, and there was the suggestion to confirm I have APT. I checked, and do.
I read a suggestion on the Ubuntu forum to "unset /tmp as noexec". So, I tried this
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david@david-OptiPlex-7010 ~ $ sudo mount -o remount,noexec /tmp [sudo] password for david: mount: /tmp not mounted or bad option In some cases useful info is found in syslog - try dmesg | tail or so. david@david-OptiPlex-7010 ~ $