"I love Virtualbox but I have some useful input for people who might have reinstalled Linux Mint and found that their Virtual Box will no longer run their previously saved machine. The version that comes with Linux Mint is actually "virtualbox-qt" which is different from Oracle's version which is called "virtualbox-6.1". If you were running machines in the virtualbox-6.1 and, when reinstalling Virtualbox, installed virtualbox-qt instead, you won't be able to run those machines. Make sure you are running the correct version of Virtualbox and stick to that version through any upgrades. See https://itsfoss.com/install-virtualbox-ubuntu/ for details."
"It's not as nice as the Windows version of Keepass 2. It works well enough, but I suggest you try one of the password managers that others suggest. This is open-source but hasn't been updated since 2016."
"Will not recognize devices connected as MTP such as a smartphone. Since backing up certain data on a smartphone is so important (without synching everything to Google -- blecch), I consider this a serious flaw. I am not sure what alternative program can backup MTP devices, and my Linux won't recognize my phone as USB mass storage."
"It has interface glitches, especially when you minimize the window and later restore it. When this problem happens, you can't see what you are doing anymore, and you have to close the program and restart it. Otherwise it works great, and it's one of the few programs in Linux (the only one?) that supports KeePass 2 files. But this glitch is inexcusable."