I invoked an apt install (of mysql-workbench) by double-clicking its downloaded .deb file.
It hangs at the "preparing" stage and clicking the Cancel button does nothing. ps aux | grep apt didn't find any process running.
What process name should I look for, and how do I kill it?
Double-clicking a .deb file opens it for installation in the Software app. The Software app is named gnome-software in Ubuntu. You can force close the Software app by finding gnome-software in the System Monitor app, right-clicking it, then stop/end it, or from the terminal by running pkill gnome-software.
If double-clicking the .deb file the first time generated an error message, I recommend trying to install it from the terminal with sudo apt install ./FILE.deb the next time in order to get verbose output from the software installation command that will help to troubleshoot the problem with installing FILE.deb. For example if there are unmet dependencies the results of sudo apt install ./FILE.deb will list them.
