Test for Ubuntu and Ubuntu version

linux/setup_repo.sh

@@ -3,8 +3,40 @@
 # This script installs a Jamulus repository to Debian based systems
 
 if [[ ${EUID} -ne 0 ]]; then
-     echo "Error: This script must be run as root."
-     exit 1
+    echo "Error: This script must be run as root."
+    exit 1
+fi
+
+# Check for apt version >= 2.2.0 (if found, assuming Debian-based compatible with repo)
+# Issue: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1950095
+
+if APT_VERSION="$(apt --version)"; then
+    APT_MAJOR=$(echo "$APT_VERSION" | cut -d' ' -f 2 | cut -d'.' -f 1)
+    APT_MINOR=$(echo "$APT_VERSION" | cut -d' ' -f 2 | cut -d'.' -f 2)
+else
+    echo "This script is only compatible with Debian based distributions which have apt, but apt is not available. Please check that your OS is supported."
+    exit 1
+fi
+
+if (($(echo "${APT_MAJOR}.${APT_MINOR} < 2.2" | bc -l))); then
+    echo "Your apt version is incompatible. You may not be able install this repository. "
+    echo "See: https://github.com/orgs/jamulussoftware/discussions/3180"
+    echo "Also of interest: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1950095"
+    echo "Please update your OS or use the .deb package from the Website to manually install Jamulus."
+    echo "Do you wish to attempt to install the repository anyway?"
+    echo "(not recommended, as you might need to fix your apt configuration)"
+    select yn in "Yes" "No"; do
+        case $yn in
+            Yes)
+                echo "Proceeding with override. You have been warned!"
+                break
+                ;;
+            No)
+                echo "Exiting."
+                exit 0
+                ;;
+        esac
+    done
 fi
 
 REPO_FILE=/etc/apt/sources.list.d/jamulus.list
@@ -18,8 +50,8 @@ curl --fail --show-error -sLo "${KEY_FILE}" https://github.com/${GITHUB_REPOSITO
 
 CURL_EXITCODE=$?
 if [[ ${CURL_EXITCODE} -ne 0 ]]; then
-      echo "Error: Download of gpg key failed. Please try again later."
-      exit ${CURL_EXITCODE}
+    echo "Error: Download of gpg key failed. Please try again later."
+    exit ${CURL_EXITCODE}
 fi
 
 echo "Running apt update..."