Update update.sh

update.sh

@@ -1,6 +1,13 @@
 #!/bin/bash
 set -e
 
+if [ -f /etc/os-release ]; then
+    # freedesktop.org and systemd
+    . /etc/os-release
+    OS=$NAME
+    VER=$VERSION_ID
+fi
+
 # Ubuntu 20.04 workaround
 printf -- '\033[33m Remove neovim if already installed\n\033[37m'
 sudo apt -y purge --auto-remove neovim
@@ -100,7 +107,9 @@ rm ~/lazygit && rm ~/lazygit.tar.gz
 
 # Install gdu
 printf -- '\033[33m Installing gdu\n\033[37m'
+if [ $VER = "22.04" ]; then
 sudo add-apt-repository -y ppa:daniel-milde/gdu
+fi
 sudo nala update
 sudo nala install -y gdu