fix mithril.re repositories on fresh install

src/main

@@ -64,10 +64,14 @@ REQUIRED_PACKAGES=(
 
 echo "# configure apt sources to the mithril's"
 echo "========================================"
+
+if ! grep -q debian.mithril.re /etc/apt/sources.list; then
     echo "deb http://debian.mithril.re/debian bullseye main contrib non-free" | sudo tee /etc/apt/sources.list
     echo "deb http://debian.mithril.re/debian bullseye-updates main contrib non-free" | sudo tee -a /etc/apt/sources.list
     echo "deb http://debian.mithril.re/debian-security/ bullseye-security main contrib non-free" | sudo tee -a /etc/apt/sources.list
-
+    sudo apt update
+    sudo apt autoremove -y
+else
     echo "# updating repositories"
     echo "==================="
     if [[ $(date --date='-12 hours' +%s) -gt $(date -d "$(stat -c %y /var/lib/apt/lists/partial)" +%s) ]]; then
@@ -76,6 +80,7 @@ if [[ $(date --date='-12 hours' +%s) -gt $(date -d "$(stat -c %y /var/lib/apt/li
     else
         echo "repositories recently updated!"
     fi
+fi
 
 echo "# required packages"
 echo "==================="