Simplify mirror identification

"main upstream import" is enough to ID the Mint repository.

Author: clefebvre

debian/control

@@ -19,13 +19,12 @@ Depends:
  python3-apt,
  python3-pycurl,
  python3-setproctitle,
- python3-xapp (>= 2.4.2),
+ python3-xapp (>= 1.6),
  synaptic,
  systemd,
  mint-common (>= 2.2.4),
  mint-mirrors,
  mint-upgrade-info,
- python3-xapp (>= 1.0.1),
  gir1.2-notify-0.7,
  gir1.2-xapp-1.0
 Description: The Linux Mint Update Manager

usr/lib/linuxmint/mintUpdate/mintUpdate.py

@@ -29,8 +29,6 @@
 
 from Classes import Update, PRIORITY_UPDATES, UpdateTracker
 from xapp.GSettingsWidgets import *
-import xapp.os
-
 
 settings = Gio.Settings(schema_id="com.linuxmint.updates")
 cinnamon_support = False
@@ -1191,12 +1189,10 @@ def mirror_check(self):
         try:
             if os.path.exists("/usr/bin/mintsources") and os.path.exists("/etc/apt/sources.list.d/official-package-repositories.list"):
                 mirror_url = None
-
-                codename = xapp.os.get_os_release_info()["VERSION_CODENAME"]
                 with open("/etc/apt/sources.list.d/official-package-repositories.list", 'r') as sources_file:
                     for line in sources_file:
                         line = line.strip()
-                        if line.startswith("deb ") and "%s main upstream import" % codename in line:
+                        if line.startswith("deb ") and "main upstream import" in line:
                             mirror_url = line.split()[1]
                             if mirror_url.endswith("/"):
                                 mirror_url = mirror_url[:-1]