Merge pull request #367 from fhoekstra/patch-1

Update install instructions for Linux Mint

Author: lsm5

docs/installation.md

@@ -173,8 +173,6 @@ sudo apt-get -y install podman
 
 Follow the steps for Ubuntu (or Debian if you use LMDE).
 
-Replace `$(lsb_release -rs)` with `$(grep DISTRIB_RELEASE= /etc/upstream-release/lsb-release | cut -d "=" -f 2)` for Ubuntu steps.
-
 ### Installing development versions of Podman
 
 #### [Fedora](https://getfedora.org)