I'm having an error I can't fix with tails where it just boots up into a blue screen with a cursor but stays there forever and I can't find a solution but tails on virtual box works completely fine but idk if it's safe so I haven't installed or done anything with it. is it safe to have tails on virtual box on a flash drive
Slim chance, but do you have an obscure graphics card? Sounds like xServer can't start up. I'm not 100% but I'd bet vBox is emulating a video card and that's why it will start up.
If tails is Linux based, and I believe it is, there is a key combo you can hit to get to a terminal and be able to paste a command that may fix this. Ctl alt 1 - 5 I think? So I'd Google "tails x server won't start " and include your video card.
Could be maybe default resolution isn't supported?
As for your security concerns, sorry I have no idea.