[tde-users] Trinity Trouble - Konqueror?

Hi everyone. Unfortunately, I was forced to remove my installation of Trinity/PCLinuxOS this morning, due to Firefox and Thunderbird not working correctly. Specifically, Firefox was repeatedly asking to be the default browser, even as I previously selected it as the default. And Thunderbird, in the middle of all this, would no longer open links at all, deciding to automatically add a new 'account' relating to news and feeds. Both Vivaldi and Chromium were also installed as browsers, but once both of these were removed, Firefox and Thunderbird continued to exhibit the same behavior. Upon installing first Trinity/Ubuntu 20.04.1 and then Lubuntu 20.04 LTS, I was unable to get HPLIP (as hp-setup) with either OS to communicate with my HP printer, which was USB-connected. Final attempt, was to install Debian (10, LXQt). Fortunately, this was able to detect the printer using hp-setup, however neither hp-systray nor the HPLIP Toolbox (GUI) will launch. I am extremely hesitant to install Trinity on top of this Debian installation, because I am afraid that with Konqueror included as the default file manager, I will have the same issues with Firefox and Thunderbird. I suspect that something with PCLOS may have changed, causing it to detect both Firefox and Konqueror as web browsers, instead of a web browser and a file manager. I don't know. I have been fiddling with this for the past seven hours now. I just want it to work. Thanks in advance for any advice/suggestions/etc.