There’s absolutely no need to make Bladebit, just download bladebit-cuda-v3.1.0-ubuntu-x86-64.tar.gz from the below link, and extract BB. You can use the file explorer app to navigate to where you want it, just copy and paste (remember Crtl+shift+C and Crtl+shift+V). Right click in the file explorer Window and click open terminal here. If it doesn’t run you may need to change the permissions on the file, I can’t remember the command for that but one of the others will know.
You can amuse yourself with my troubles in this thread, and there may be some useful info in there.
PS. Watch out if copying and pasting, being a Windows user it normal to hit Ctrl+V, but that doesn’t work, then you remember and hit Ctrl+shift+V but then you get weird characters pasted, for someone reason Ctrl+V triggers them.