Merge branch 'feature/KASM-5617_merge_github_pull_requests' into 'master'

Update debian user setup command

Closes KASM-5617

See merge request kasm-technologies/internal/KasmVNC!124

README.md

@@ -27,7 +27,7 @@ wget <package_url>
 sudo apt-get install ./kasmvncserver_*.deb
 
 # Add your user to the ssl-cert group
-sudo addgroup $USER ssl-cert
+sudo adduser $USER ssl-cert
 ```
 
 ### Oracle 8