So I have been browsing through here trying to find someone with same issue as me but can’t quite find it.
I just bought 1 month plex subscription and wondering how to go about updating/upgrading plex.
Can’t quite find the syntax I thought it was sudo su, plexUpgrade or similar but can’t quite find that.
Or would it be simplest to uninstall plex and reinstall it?
And would that make me loose my config files and all that if I may ask?
Advice would be appreciated 
It’s:
sudo su -
upgradePlex:
upgradePlex
Please enter in your Plex Email and Password
Note, this is not shared outside this update
Email: [email protected]
Pass: plex_user_password
Authenticating ... OK
Finding download URL to download ... OK
Downloading release "plexmediaserver_1.3.4.3285-b46e0ea_amd64.deb" ... OK
Starting Version Comparison
Currently installed version is 1.3.3.3148
Downloaded version is 1.3.4.3285
1.3.4.3285 is greater than 1.3.3.3148
Installing downloaded plex ...
(Reading database ... 141031 files and directories currently installed.)
Preparing to unpack .../plexmediaserver_1.3.4.3285-b46e0ea_amd64.deb ...
Removed symlink /etc/systemd/system/multi-user.target.wants/plexmediaserver.service.
Unpacking plexmediaserver (1.3.4.3285-b46e0ea) over (1.3.3.3148-b38628e) ...
Setting up plexmediaserver (1.3.4.3285-b46e0ea) ...
Created symlink from /etc/systemd/system/multi-user.target.wants/plexmediaserver.service to /lib/systemd/system/plexmediaserver.service.
Processing triggers for desktop-file-utils (0.22-1ubuntu5) ...
Processing triggers for mime-support (3.59ubuntu1) ...
Processing triggers for systemd (229-4ubuntu16) ...
Processing triggers for ureadahead (0.100.0-19) ...
Restarting Plex Media Server service ...
Deleted "plexmediaserver_1.3.4.3285-b46e0ea_amd64.deb"
1185/64388MB 2.97 2.77 2.88 4/537 18849
[18402:18401 0:232] 07:24:01 Thu Feb 02 [root@sb] ~Oh damn, thanks for that. Hmm wish there was a nice sticky help file or so with all those nifty commands, so seldom I use those. Unless there already is such a post but I failed to find it.
But really appreciated for your speedy reply! 
Here’s a fun one.
sudo -s
box
you can browse through all the available install commands
As for upgrade,
sudo -s
upgrade [press tab key]
you get the following:
upgradeBTSync upgrade-from-grub-legacy upgradePlex upgradepyLoad
upgradeDeluge upgradeJackett upgradePlexRequests upgradeQuickBox
enjoy
I promise that there will be a big addition to the Wiki this weekend! I have several articles waiting at the ready, I am now only cleaning them up before publishing. The lack of command line documentation has been driving me bonkers.
Also, for all us GitHub lovers and account holders. I am cloning QuickBox over to GitHub. It simply has a better user and API resource. Not to mention, it’s a platform that people tend to just understand better. I will be processing all the lab.quickbox.io elements out of the github repository… but if anyone in the meantime would like to help 