Change to Ubuntu Focal.

Vagrantfile

@@ -4,7 +4,7 @@
 VAGRANTFILE_API_VERSION = "2"
 
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
-  config.vm.box = "ubuntu/xenial64"
+  config.vm.box = "ubuntu/focal64"
   config.vm.network "forwarded_port", guest: 8080, host: 9080
   config.vm.network "forwarded_port", guest: 80, host: 8180
   config.vm.network "forwarded_port", guest: 443, host: 8443

kerberos/setup-kerberos-credentials.sh

@@ -6,9 +6,9 @@ sudo kadmin -l init --realm-max-ticket-life=unlimited \
 sudo kadmin -l add --random-key --max-ticket-life='1 day' \
 	--max-renewable-life='1 week' --expiration-time=never \
 	--pw-expiration-time=never --attributes='' \
-	--policy='default' host/ubuntu-xenial.testdomain
+	--policy='default' host/ubuntu-focal.testdomain
 
-sudo kadmin -l ext_keytab host/ubuntu-xenial.testdomain
+sudo kadmin -l ext_keytab host/ubuntu-focal.testdomain
 sudo ktutil list
 
 sudo kadmin -l add --password='password' --max-ticket-life='1 day' \

kerberos/setup-kerberos.sh

@@ -17,6 +17,6 @@ sudo service ssh restart
 
 sudo sed -r -i'' \
 	-e 's/^(127\.0\.0\.1.localhost)/\1.testdomain localhost kdc/' \
-	-e 's/^(127\.0\.1\.1.ubuntu-xenial)/\1.testdomain ubuntu-xenial/' \
+	-e 's/^(127\.0\.1\.1.ubuntu-focal)/\1.testdomain ubuntu-focal/' \
 	/etc/hosts
 #	-e '/precise64/s/$/\n127.0.2.1\tkdc.testdomain kdc/'