[pkgselectprocess] Add a more robust check for apt packages when installing them (LP: #2089494).

common/modules/pkgselectprocess/PackageSelectProcess.cpp

@@ -361,7 +361,14 @@ Calamares::JobResult PackageSelectProcess::exec()
     if (!debPackages.isEmpty()) {
         const QString packageList = debPackages.join(" ");
         const QString installCommand = QString(
-            "DEBIAN_FRONTEND=noninteractive apt-get -y install $(for pkg in %1; do dpkg -s \"$pkg\" &>/dev/null || echo -n \"$pkg \"; done)"
+            "packages_to_install=$(for pkg in %1; do "
+            "if ! dpkg -s \"$pkg\" &>/dev/null && apt-cache show \"$pkg\" &>/dev/null; then "
+            "printf \"%s \" \"$pkg\"; "
+            "fi; "
+            "done); "
+            "if [ -n \"$packages_to_install\" ]; then "
+            "DEBIAN_FRONTEND=noninteractive apt-get -y install $packages_to_install; "
+            "fi"
         ).arg(packageList);
 
         Calamares::JobResult installResult = runAptCommand(installCommand,

debian/changelog

@@ -2,6 +2,8 @@ calamares-settings-ubuntu (1:25.04.10) UNRELEASED; urgency=medium
 
   * [pkgselectprocess] Add dpkg diversions for dracut, update-initramfs, and
     locale-gen. These will be called later in the process.
+  * [pkgselectprocess] Add a more robust check for apt packages when
+    installing them (LP: #2089494).
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Sun, 24 Nov 2024 20:22:55 -0600