Updating README.Linux

[AnHeuermann]

Related Issues

• The deb-src with contrib is no longer working. Using lsb_release nightly instead.

Purpose

Something changed and now instead of

deb [arch=amd64 signed-by=/usr/share/keyrings/openmodelica-keyring.gpg] https://build.openmodelica.org/apt jammy nightly
deb-src [arch=amd64 signed-by=/usr/share/keyrings/openmodelica-keyring.gpg] https://build.openmodelica.org/apt nightly contrib

one has to to use

deb [arch=amd64 signed-by=/usr/share/keyrings/openmodelica-keyring.gpg] https://build.openmodelica.org/apt jammy nightly
deb-src [arch=amd64 signed-by=/usr/share/keyrings/openmodelica-keyring.gpg] https://build.openmodelica.org/apt jammy nightly

[AnHeuermann]

As far as I can tell contrib is the Debian version of Ubuntus Universe repository, so that would be the correct way to lable our https://build.openmodelica.org/apt repository.
@sjoelund @adrpo Did we change something or why is nightly contrib no longer working for me?