Set Ubuntu fallback suite to the latest LTS, i.e. 18.04 Bionic

NEWS.markdown

@@ -27,6 +27,7 @@ Distribution Releases Changes
 * Preliminary support for Ubuntu 19.04 Disco Dingo
 * Knows about code name for Debian 12 (Bookworm).
 * Considers Ubuntu Yakkety, Zesty and Artful being EoL.
+* Set Ubuntu fallback suite to the latest LTS, i.e. 18.04 Bionic.
 
 Other Changes
 -------------

bin/xt-guess-suite-and-mirror

@@ -62,7 +62,7 @@ my %fallback_mirror = ( Debian => 'http://deb.debian.org/debian/',
 # have aliases like stable or testing, so we take the nearest LTS
 # release which is 10.04 at the time of writing.
 my %fallback_suite = ( Debian => 'stable',
-                       Ubuntu => 'lucid' );
+                       Ubuntu => 'bionic' );
 
 # Where to look for the sources.list to parse
 my @sources_list_files = ( '/etc/apt/sources.list',

debian/changelog

@@ -18,6 +18,7 @@ xen-tools (4.8-1) UNRELEASED; urgency=medium
     + Change all occurrences of httpredir.debian.org to deb.debian.org
       except those for the debian-archive. The latter now point to
       archive.debian.org directly.
+    + Set Ubuntu fallback suite to the latest LTS, i.e. 18.04 Bionic.
 
     [ Nico Boehr ]
     + Add support for LVM thin provisioning.