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6/14/2019 - the 'old' comet (rhel6-64) is replaced with ubuntu 18.04.2

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At https://ubuntu.com, select "Ubuntu Desktop" LTS (Long-term support) which is currently v18.04.2
Download. The file should be ubuntu-18.04.2-desktop-amd64.iso and is about 1.9 GB in size
Insert a fresh DVD (4.7 GB) into the drive
$ cdrecord -v -dev='/dev/scd0' ubuntu-18.04.2-desktop-amd64.iso
If you are uncertain as to the proper device name, you may use the command "cdrecord --devices" to find out.

Boot from installation disc created above
Select "Normal Install" (rather than "Minimal")
Follow your nose...
At some point, the installation script will assess the contents of your system disk. There are several choices: automatic install (empty disk or overwrite anything that is already there); install along side whatever is already there; create your own partitions. Select this last option.
Now you will see a list of all the hard drives on the computer (typically only one). Select "New Partition Table", and then manually add partitions from the table below.

Mount point Size (GB) Notes
/boot 2
/ 30
/home 30
swap 24 (I selected 3x RAM, but need not be this large)
/opt 40
/tmp 10
/var 10
/scswork 10
/usr/vice/cache 5
/scratch all remaining
Define your local account. NOTE: this should NOT be the same as your SLAC unix account userid.
Allow the installation to proceed. (~10 min)
Reboot, remove the installation dvd, and log in!
One of the first items will be the OS will want to download and install a hefty number of updates. (~10 min)

Space shortcuts

Mount point	Size (GB)	Notes
/boot	2
/	30
/home	30
swap	24	(I selected 3x RAM, but need not be this large)
/opt	40
/tmp	10
/var	10
/scswork	10
/usr/vice/cache	5
/scratch	all remaining