Debian 8 : No LSB modules are available

Solution 1:

As the error message says lsb_release command is installed but lsb module isn't. Use this command to solve the problem:

apt-get install lsb-core

I suggest to use lsb_release -a instead of lsb_release. It shows more useful output.

Solution 2:

I just moved to Debian 11, Bullseye and, in order to check the release, you have to type

lsb_release -cs

lsb-core in Bullseye does not exist.