Texlive 2021 and tlmgr: an unsolved issue

Question

I have installed Texlive 2021 on UBUNTU 21.04 from tug.org. I have had to install it as root user since, while trying to install it as simple user he didn't let the installer write in some directories. Following, the guide I have updated the paths in the $HOME/.profile file adding the following expressions:

if [ -d "/usr/local/texlive/2021/bin/x86_64-linux" ] ; then PATH="$HOME/usr/local/texlive/2021/bin/x86_64-linux:$PATH" fi if [ -d "/usr/local/texlive/2021/texmf-dist/doc/man" ] ; then MANPATH="/usr/local/texlive/2021/texmf-dist/doc/man:$MANPATH" fi if [ -d "/usr/local/texlive/2021/texmf-dist/doc/info" ] ; then INFOPATH="/usr/local/texlive/2021/texmf-dist/doc/info:$INFOPATH" fi This way Latex works fine. As for tlmgr, in root mode, I can open and operate the GUI. I tried, still in root mode (in user mode ir says I have to run it in root mode)

tlmgr update --self (and > tlmgr update --self)

It gave me the following message:

(running on Debian, switching to user mode!) (see /usr/share/doc/texlive-base/README.tlmgr-on-Debian.md) TLPDB: not a directory, not loading: /root/texmf tlmgr: user mode not initialized, please read the documentation!

I tried to employ --usermode and --usertree with no success. Finally I wrote

PATH=/usr/local/texlive/2021/bin/x86_64-linux:$PATH; export PATH MANPATH=/usr/local/texlive/2021/texmf-dist/doc/man:$MANPATH; export MANPATH INFOPATH=/usr/local/texlive/2021/texmf-dist/doc/info:$INFOPATH; export INFOPATH"

This way it works. Any alternative, that saves me copying and pasting those instruction? When writing

echo $PATH, >echo $MANPATH, echo $INFOPATH, the terminal lists the corrects directories. What's missing? I think I should set a PATH, but where? Thanks in advance

UPDATE! (partially solved but not quite)

I copied the $PATH, $MANPATH, $INFOPATH on the .basch file. Now

tlmgr update -all

works fine Unfortunately

tlmgr update --self

responds this way.

tlmgr: Local TeX Live (2020) is older than remote repository (2021). Cross release updates are only supported with update-tlmgr-latest(.sh/.exe) --update See https://tug.org/texlive/upgrade.html for details.

I have tried to follow the suggestions on the upgrade page of tug.org/texlive without success.

Answer 1

After install texlive 2021 from Installing TeX Live over the Internet:

Add to your .profile:

PATH=/usr/local/texlive/2021/bin/x86_64-linux:$PATH; export PATH
MANPATH=/usr/local/texlive/2021/texmf-dist/doc/man:$MANPATH; export MANPATH
INFOPATH=/usr/local/texlive/2021/texmf-dist/doc/info:$INFOPATH; export INFOPATH

and to .bash_aliases:

alias psudo='sudo env PATH="$PATH"'

Update texlive with:

psudo tlmgr update --all

(I have done this for years, in Ubuntu and Debian)