I ran the installation without admin privileges, and the Sage Console seemed to be working. But I don't like dark mode, so I was trying to find my way around to figure out how to invoke lightBG (which I thought was supposed to be the default). Not finding that easy, I was surprised to discover that no environment variables had been created or new PATH items added. Eg., I could not run sage at the command line (without a full path). So I thought that maybe I should run the installer with admin privileges and install it for everybody. Even worse! Now, on trying to start the console, bash is immediately and repeatedly complaining "could not find file /tmp".
Furthermore, still no additions to environment variables or to PATH.
I did try starting bash and issuing command "mkdir /tmp". It claims to have succeeded. But it did not help for the console. Furthermore, a second attempt is met with "file exists".
Any helpful suggestions would be appreciated.