Avoid dpkg interactive conflict resultion dialog while building. Keep…

… already existing /etc/NetworkManager/NetworkManager.conf by qubes-core-agent-linux.

workaround for Qubes issue: 'use /etc/NetworkManager/conf.d snippet instead of /etc/NetworkManager/NetworkManager.conf to avoid dpkg interactive conflict resolution dialog questions'
QubesOS/qubes-issues#1176

build-steps.d/1700_install-packages

@@ -385,7 +385,16 @@ $whonix_build_script_skip_package_install${reset}"
 
    pkg-install-maybe anon-shared-desktop
 
+   ## Keep already existing /etc/NetworkManager/NetworkManager.conf by qubes-core-agent-linux.
+   ## Avoid dpkg interactive conflict resultion dialog while building.
+   ## workaround for Qubes issue:
+   ## 'use /etc/NetworkManager/conf.d snippet instead of /etc/NetworkManager/NetworkManager.conf to avoid dpkg interactive conflict resolution dialog questions'
+   ## https://github.com/QubesOS/qubes-issues/issues/1176
+   local temp
+   temp=" -o Dpkg::Options::=--force-confold "
+   apt_unattended_opts+="$temp"
    pkg-install-maybe anon-shared-desktop-kde
+   apt_unattended_opts="$(echo "$apt_unattended_opts" | sed "s|$temp||g")"
 
    pkg-install-maybe anon-shared-kde-accessibility
 
@@ -423,8 +432,11 @@ $whonix_build_script_skip_package_install${reset}"
       ## a default /etc/fstab.
       ## The qubes-whonix package also ships /etc/fstab.
       ## This would result in an interactive dpkg conflict resolution dialog.
-      apt_unattended_opts+=" -o Dpkg::Options::=--force-confnew "
+      local temp
+      temp=" -o Dpkg::Options::=--force-confnew "
+      apt_unattended_opts+="$temp"
       pkg-install-maybe qubes-whonix
+      apt_unattended_opts="$(echo "$apt_unattended_opts" | sed "s|$temp||g")"
    fi
 
    "$WHONIX_SOURCE_HELP_STEPS_FOLDER/remove-local-temp-apt-repo"