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.