Hi guys..I hope you doing well..I just
Installed new Debian OS.it stuck in command prompt.i have logged in but it just shows:
root@debian:
Other problem is... when I try to use my other hard drive with Linux mint OS
It keeps showing installation process even though I took out my USB booting drive..any help

Don't panic! We need to collect some more information. I can think of 2 or 3 situations that could lead to this. For a start, did you get a message during boot-up that something was wrong and that you needed to press ctrl-D and log in as root? Or did it go all the way to a normal login, but with no graphics? If you press ctrl-F2 or ctrl-F3, do you get a different login screen? If so, then you have booted successfully all the way to the command line and we just need to find why your graphical desktop has not come up.

You should have created a non-root user during the installation process? Try logging in as that user and typing startx to bring up the graphics.
I haven't come across that one before! Are you sure you actually installed it? You didn't just copy the installation image over to your hard drive?

You probably will want to simply repeat the installation – at some point you must have made the wrong selection. (Or maybe you downloaded a "server" variation of th distro, instead of a "desktop" one?)

Unlike Microsoft Windows – which is completely "GUI-centric" – the Linux operating system has many variations, some of which do not use a GUI at all. (For example, "servers" commonly don't.) And even then, Linux's implementation of "a GUI" is under-the-hood completely different.

"Welcome aboard! Yes, we're here to help you."

It might be that you skipped the desktop installation, either by not ticking the appropriate box when the installer asked or by installing the server setup instead. So before re-installing, see the The Debian Administrator's Handbook about the Aptitude utility.