Ubuntu 16.04

• DON'T use tlmgr
• Search ubuntu package with :

apt search <package_name>

tlmgr - DON'T use it

sudo apt install xzdec
tlmgr init-usertree
tlmgr update --self
tlmgr install <package_name>

You'll get an error... Unknown directive ...containerchecksum [...]

Know the current of a package

• Run the compilation of your .tex file,
• grep PACKAGE FILE.log