Dear Kornel,
with your help I have a functioning TL GUI installation.
The active GUI can be called as user from Konsole, which is what I was
heading for.
However, editing of the GUI became possible only after giving write
permission to 'tlpkg' in
/usr/bin/texlive/2016/tlpkg
I presume that was a necessary change to do ?!
I find two installations:
/usr/bin/texlive/2016/bin/x86_64-linux (413 items)
and
/usr/local/texlive/2016/bin/x86_64-linux (413 items)
Both are of the same structure and size (139,5 MiB) and both have
'tlmgr' in /x86:64-linux.
Settings of PATH in '.bash_profile':
PATH=/usr/local/texlive/2016/bin/x86_64-linux:$PATH; export PATH
(INFOPATH and MANPATH are set accordingly)
My core question is now:
Do I have to keep both installations as they are or should/could I
remove one (for reason of saving space) without loosing functionality ?
Which of the two could/should possibly be removed and if so, how to
safely do that?
Sorry for asking, meanwhile I am over-cautious :-\
Thanks and cheers,
Michael