I found this procedure on the webs and used it slightly modified, as outlined below.

Become root with sudo su -
Insert the USB drive, and find its device name.

lsblk

sdk                 8:160  1  31.6G  0 disk
└─sdk1              8:161  1  13.7G  0 part /run/media/gill/OCTD

Unmount the partition.

umount /dev/sdk1

Run fdisk with the device name and remove existing partitions.

Connections to my postfix+imap server are "blocked" (connection refused).
Turns out the portreserve system is broken... it blocks ports the mail server needs!

for daemon in portreserve clamd cyrus-imapd spamassassin amavisd postgrey postfix
do
/sbin/service $daemon stop
done
for daemon in postfix postgrey amavisd spamassassin cyrus-imapd clamd portreserve
do
/sbin/service $daemon start
done


The following updates returned messages
media_wysiwyg module
Update #7203

CKEditor integration has been moved to the Media CKEditor module.If you are using the stand-alone CKEditor module in combination with the CKEditor plugin provided by Media WYSIWYG then you must download and enable the Media CKEditor module.

#add a user (I choose pi)
sudo useradd -m -c "Pi Octoprint" pi
#Be sure to give him a password
sudo password pi
#make sure it's up to date
sudo apt-get update
#install python building tools
sudo apt-get install build-essential python-dev python-pip python-virtualenv

NOW you can start with the instructions https://github.com/foosel/OctoPrint
Specifically,

Kept seeing this error
badlogin: fairlane.fishparts.net [192.168.83.10] DIGEST-MD5 [SASL(-13): user not found: no secret in database]
When trying to login as janice.
Needed to add janice to the correct realm:
saslpasswd2 -c janice -u mail.fishparts.net
That did the trick.

Get the filter rules

Steps to update the sieve filter rules.

If you use the Linux shell very much, you find its history functions very useful. You can recall previous commands very easily, just using the arrow keys.
If you use the Workload Scheduler command-line interfaces, conman and composer, you really miss the history. Sure there's the redo command, but its editing capability is limited to the last command you typed.

$ sudo firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -m state --state NEW -m udp -p udp --sport 5002 -j ACCEPT
success
$ sudo firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -m state --state NEW -m udp -p udp --sport 5004 -j ACCEPT
success
$ sudo firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -m state --state NEW -m udp -p udp --sport 65001 -j ACCEPT
success
$ sudo firewall-cmd --reload