Why when I try to extract files from a .rar archive they all have 0kb? Is there any alternative program to handle rar files?
Not Whonix-specific, but you can use 7z instead of lxqt-archiver.
Can you tell me how to install 7z correctly. I have sudo privileges
Unspecific to Whonix:
Can be resolved as per:
Use the apt package manager to install the 7zip package.
Is installed, I understand there is no GUI version? So how can I unpack the archive?
Answers are readily available online. Example:
the thread you posted describes unpacking using the console, and I wanted to use the GUI version of the program, preferably adding a keyboard shortcut for unpacking after right-clicking
If 7zip doesn’t have a GUI version, maybe there’s an alternative?
This forum is not intended for getting help with how to use Linux in general. Other sites (like the Stack Exchange Q&A sites “Super User” and “Unix & Linux”) are more suitable for that.
There are many archiver frontends available for Linux that may be able to handle RAR files. Which one you should use (if any) is up to you. See also:
Maybe PeaZip.