Hello - I was wondering if there is a way to determine if my installation of Plex is 32-bit or 64-bit. I have an instance on Ubuntu, and it’s updating through the OS’s software updater, but I can’t see whether I’m using 32-bit or 64-bit. Any help would be appreciated!
Server Version#: 1.29.1.6260
Player Version#:
You can find that info specific to Plex Media Server in your server logs. The 1st line usually contains that information:
Sep 25, 2022 02:00:44.435 [0x7f5927090b00] INFO - Plex Media Server v1.29.0.6244-819d3678c - Ubuntu PC x86_64 - build: linux-x86_64 debian - GMT 02:00
on my system → Ubuntu PC x86_64 means it’s a 64bit architecture setup.
You can also check the OS architecture out in the terminal, e.g. using the command uname -m
Edit: leaving mainly the question what you’re actually trying to achieve 
Try looking in /var/cache/apt/archives for the plexmediaserver package. The bitness should be indicated in the package name.
mediainfo package. Then use on the CLI with mediainfo <filename>
[chuck@lizum ~.2004]$ mediainfo How\ to\ Train\ Your\ Dragon\ 2\ \(2014\).mkv
General
Unique ID : 268384545435019238454624372053891457176 (0xC9E8FBB758E119DD1A7278366EF9A098)
Complete name : How to Train Your Dragon 2 (2014).mkv
Format : Matroska
Format version : Version 4
File size : 20.3 GiB
Duration : 1 h 41 min
Overall bit rate mode : Variable
Overall bit rate : 28.5 Mb/s
Encoded date : UTC 2018-02-14 01:07:03
Writing application : mkvmerge v20.0.0 ('I Am The Sun') 64-bit
Writing library : libebml v1.3.5 + libmatroska v1.4.8
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 1 h 41 min
Bit rate mode : Variable
Maximum bit rate : 32.2 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Language : English
Default : No
Forced : No
[chuck@lizum ~.2003]$ dpkg -l | grep -i plexm
ii plexmediaserver 1.28.2.6106-44a5bbd28 amd64 Plex organizes all of your personal media so you can easily access and enjoy it.
[chuck@lizum ~.2004]$
amd64 is the 64 package on Ubuntu/Debian.
[chuck@lizum ~.2006]$ head /var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Logs/Plex\ Media\ Server.log
Sep 10, 2022 13:07:01.987 [0x7fae19af0b00] INFO - Plex Media Server v1.28.2.6106-44a5bbd28 - Ubuntu PC x86_64 - build: linux-x86_64 debian - GMT -04:00
Sep 10, 2022 13:07:01.987 [0x7fae19af0b00] INFO - Linux version: 20.04.5 LTS (Focal Fossa), language: en-US
Sep 10, 2022 13:07:01.987 [0x7fae19af0b00] INFO - Processor: 8-core Intel(R) Core(TM) i7-8809G CPU @ 3.10GHz
Sep 10, 2022 13:07:01.987 [0x7fae19af0b00] INFO - Compiler is - Clang 11.0.1 (https://plex.tv 9b997da8e5b47bdb4a9425b3a3b290be393b4b1f)
Sep 10, 2022 13:07:01.987 [0x7fae19af0b00] INFO - /usr/lib/plexmediaserver/Plex Media Server
Sep 10, 2022 13:07:01.988 [0x7fae1d8851c0] DEBUG - BPQ: [Idle] -> [Starting]
Sep 10, 2022 13:07:01.988 [0x7fae1d8851c0] DEBUG - FeatureManager: Using cached data for features list
Sep 10, 2022 13:07:02.009 [0x7fae1d8851c0] DEBUG - HttpServer: Listening on IPv6 as well as IPv4.
Sep 10, 2022 13:07:02.009 [0x7fae1d8851c0] DEBUG - HttpServer: Listening on port 32400.
Sep 10, 2022 13:07:02.009 [0x7fae1d8851c0] DEBUG - HttpServer: Listening on port 32401.
[chuck@lizum ~.2007]$
Awesome, thanks guys. And as per usual, especially @ChuckPa for the very clear and concise answer 
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