I have a problem creating 7z encrypted archives in Xubuntu. I tried either Thunar and Nemo, but the password field is always greyed out. Is encryption not supported? Unfortunately I could not find any help googling it. In Ubuntu is trivial... I would like to avoid to install 7zip/peazip etc, unless very necessary to do it.
You cannot create 7zip archives without 7zip. Moreover, if you want encryption, just install p7zip-full. AFAIK, you can compress/extract any type of archive with it. sudo apt-get install p7zip-full