Update `50unattended-upgrades` and deploy

cookbooks/base/files/etc/apt/apt.conf.d/50unattended-upgrades

@@ -129,3 +129,15 @@ Unattended-Upgrade::Automatic-Reboot "false";
 
 // Allow package downgrade if Pin-Priority exceeds 1000
 // Unattended-Upgrade::Allow-downgrade "false";
+
+// When APT fails to mark a package to be upgraded or installed try adjusting
+// candidates of related packages to help APT's resolver in finding a solution
+// where the package can be upgraded or installed.
+// This is a workaround until APT's resolver is fixed to always find a
+// solution if it exists. (See Debian bug #711128.)
+// The fallback is enabled by default, except on Debian's sid release because
+// uninstallable packages are frequent there.
+// Disabling the fallback speeds up unattended-upgrades when there are
+// uninstallable packages at the expense of rarely keeping back packages which
+// could be upgraded or installed.
+// Unattended-Upgrade::Allow-APT-Mark-Fallback "true";

cookbooks/base/unattended-upgrade.rb

@@ -45,7 +45,7 @@ when "18.04"
     not_if 'test -e /var/log/cron-apt/log'
   end
 
-when '20.04'
+when '20.04', '22.04'
   %w(20auto-upgrades 50unattended-upgrades).each do |conf|
     remote_file "/etc/apt/apt.conf.d/#{conf}" do
       owner 'root'