Update virtual machine building files to Ubuntu 18.04

Author: novoselt

contrib/vm/README.md

@@ -26,7 +26,7 @@ This is optional, if you are willing to dedicate a physical machine to SageCell,
     ./build_host.sh
     ```
 
-    (If your `virt-install` does not understand `OSVARIANT=ubuntuxenial`, you may try a different version of Ubuntu here, while keeping the same `LOCATION`, `virt-install --os-variant list` may be useful. Using a different base OS is probably possible, but will likely require further changes to build commands.)
+    (If your `virt-install` does not understand `OSVARIANT=ubuntu18.04`, you may try a different version of Ubuntu here, while keeping the same `LOCATION`, `osinfo-query os` may be useful. Using a different base OS is probably possible, but will likely require further changes to build commands.)
 
 7.  You should get `ssh_host.sh` script that allows you to SSH as root to EVM. If it does not work, you probably need to adjust the IP address in it manually. Note that root password is disabled, you must use the SSH key generated during installation.
 

contrib/vm/build_host.sh

@@ -7,8 +7,8 @@ APTPROXY="http://your-proxy-here-or-delete-proxy-from-preseed/"
 MAC=52:54:00:5a:9e:c1   # Must start with 52:54:00
 
 VM_NAME=schostvm
-OSVARIANT=ubuntu16.04
-LOCATION="http://archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/"
+OSVARIANT=ubuntu18.04
+LOCATION="http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-amd64/"
 
 sed "s|APTPROXY|$APTPROXY|" preseed.host > preseed.cfg
 

contrib/vm/preseed.host

@@ -77,7 +77,7 @@ d-i passwd/make-user boolean false
 tasksel tasksel/first multiselect openssh-server, server, standard
 
 # Individual additional packages to install
-d-i pkgsel/include string haproxy lxc python3-psutil python3-yaml rsyslog-relp
+d-i pkgsel/include string haproxy lxc python3-lxc python3-psutil rsyslog-relp
 
 # Whether to upgrade packages after debootstrap.
 # Allowed values: none, safe-upgrade, full-upgrade