How to 'root-access' and delete a 'locked folder' at the desktop? SOLVED!

[Donn]

Bas,
> 'Command-line': is that another word for such a black unix shell console?
Yes. There are many names for it, but it's all the same thing. 
[ CLI - (Command Line Interface), shell, console, konsole, terminal, command, 
command line. ]

> In the case of the HPLIP folder, 'rm - r' was enough. However it is good
> to know about this 'fr' variant for other situations .....
I think it worked on your hplip folder because there were probably no other 
subfolders within it. If rm -r blah gives an error, then rm -fr blah will 
force the issue. Again, beware - gone is gone. There is no 'recycle bin' from 
the command line.

> By the way, do you know clear some reference guide that could help me to
> find my way and -especially - to better understand the 'logic' behind
> this jungle of UNIX? commands. Thanks,
That's a job for self-education. Google will get you endless answers. There is 
also built-in help at the cli, try:
man rm
That will open the 'man' page (short for manual) about the rm command. They 
may point you to info as well: info rm

Man pages are used by :
1. arrow up/down 
2. Space or page down and page up
3. Q to quit
4. Type / and a phrase to search for it. For example, /directory will 
highlight that word all over the page. Pressing 'n' will step to the next one 
found.

HTH
\d