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0. A note about running Ubuntu 20.04 LTS in VMware ESXi:
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These errors are seen in syslog every 5 seconds:

May  3 22:54:53 ubuntu2004 multipathd[738]: sda: add missing path
May  3 22:54:53 ubuntu2004 multipathd[738]: sda: failed to get udev uid: Invalid argument
May  3 22:54:53 ubuntu2004 multipathd[738]: sda: failed to get sysfs uid: Invalid argument
May  3 22:54:53 ubuntu2004 multipathd[738]: sda: failed to get sgio uid: No such file or directory

The solution is to edit the VM config in ESXi:

1. Edit Settings -> VM Options -> Advanced -> Edit Configuration
2. Set disk.EnableUUID to TRUE

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I. Install and setup Ubuntu Server
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Steps for installing/migrating to Ubuntu 20.04:

1. Backup old system, if needed.
    - /etc/ssh ?

2. Install Ubuntu.

    # maybe not use a mirror? it doesn't seem to work well, and writes
    # this URL in all the sources.list items, and then doesn't work when
    # we "apt update".
    # Mirror: http://gateway:3142/

    If LXD/Docker: Provision two partitions -- One for Ubuntu, and one for ZFS.

3. Restore ssh host keys if needed

4. Configure the apt-cacher-ng proxy host, if desired.
    a. vi /etc/apt/apt.conf.d/01proxy
        Acquire::http { Proxy "http://gateway:3142/"; };

5. Install updates
    a. apt update
    b. apt upgrade

6. install additional packages.

apt-get install build-essential automake libtool flex bison doxygen manpages-dev nfs-common nfs-kernel-server ssh subversion git vim alpine xinetd tree samba traceroute screen mtr-tiny

If LXD/Docker server (or some other server where minimal footprint is desired):

apt install ssh git vim tree traceroute screen mtr-tiny

7. set a root password.
	a. sudo bash
	b. passwd root

8. copy the old /etc/ssh files into place, and restart ssh
    (to preserve the old host keys, etc.)

9. reboot to make sure the new packages work.

10. simmons dotfiles

git clone git@tardis.nu:dotfiles
rm .bashrc .profile
cd dotfiles
./mkdotfiles.sh