The terminal starts blinking but doesn’t open, I have the same problem with Playonlinux.
the Gnome terminal? Default terminal? you can add Terminator
or find the root terminal in apps
there are other terminals you can add
try rebooting your macine
I’ve moved this to the https://community.ubuntu.com/c/support-help-requests category because this site isn’t designed to take tech support questions. Sorry. I’d recommend using one of the official support channels listed on the Finding Help page.