tlmgr: Local TeX Live (2019) is older than remote repository (2020)

I already tried what is suggested in the answer to the question:
“I got an error when trying to install a latex package trough tlmgr on ubuntu 20.04, verify_checksum: -5 “.

When I type this command:
tlmgr --verify-repo=none install beamer
I get:

(running on Debian, switching to user mode!)

tlmgr: Local TeX Live (2019) is older than remote repository (2020).
Cross release updates are only supported with
  update-tlmgr-latest(.sh/.exe) --update
See https://tug.org/texlive/upgrade.html for details.

I went to the link above (https://tug.org/texlive/upgrade.html) and as is suggested there, in the first place, i tried a “new installation” of texlive-latex-extra but nothing changed.
So I followed the guide. At the first point it says that the parent directory should be:

/usr/local/texlive/

and that, inside texlive directory, I should find a 2019 (or 2020) directory but the only directory I have is:
texmf-local:

ale@ale-ThinkPad-L13-Yoga:~$ ls /usr/local/texlive/
texmf-local

Eventually I looked for a “texlive/2019” or “texlive/2020” directory, but there are none:

ale@ale-ThinkPad-L13-Yoga:~$ sudo find / -iwholename */texlive/2020/*
find: ‘/run/user/1000/doc’: Permission denied
find: ‘/run/user/1000/gvfs’: Permission denied
ale@ale-ThinkPad-L13-Yoga:~$ sudo find / -iwholename */texlive/2019/*
find: ‘/run/user/1000/doc’: Permission denied
find: ‘/run/user/1000/gvfs’: Permission denied

I thought again that I did a wrong installation of texlive-latex-extra but after a reinstallation of “texlive-…” the problem was still there??

Go to Source
Author: alessandro

Package apache2 has no installation candidate (Kali Linux)

I’ve been trying for the past few days to install Apache2 on Kali Linux. No matter what I’ve tried, when I do sudo apt install apache2 it says that there’s no installation candidate for the package. I’m fairly new to Linux. Please help.

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package apache2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'apache2' has no installation candidate

Go to Source
Author: bl4d3

Can’t upgrade OS Install (MATE); How to solve, please?

I have seen similar issues but am not being able to quite solve the issue…

Probably easy I guess…

W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-pt_BR) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-pt) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-pt_BR) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-pt) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3

Appreciate a lot!

Go to Source
Author: Risen