I just installed ALARM on my Odroid C2 and verified my mirror list is picking up the AUR:
$this->bbcode_second_pass_code('', ':: Synchronizing package databases...
core 176.7 KiB 1767K/s 00:00 [########################################################################################] 100%
extra 2.3 MiB 6.00M/s 00:00 [########################################################################################] 100%
community 3.5 MiB 724K/s 00:05 [########################################################################################] 100%
alarm 27.1 KiB 0.00B/s 00:00 [########################################################################################] 100%
aur 27.6 KiB 2.70M/s 00:00 [########################################################################################] 100%
:: Starting full system upgrade...')
I can see the package is available here: https://archlinuxarm.org/packages/arm/plex-media-server
When I attempt to look for it on my newly updated system, I can't find it at all. I know it exist because I did this exactly last night on my Raspberry Pi 3 and found it no problems. Why would this be an issue for my Odroid C2 running the same OS. I believe only the boot (Gummi-boot) is different between the Odroid and RPi's.
I am looking for 'plex-media-server' and I can't find anything in my pacman results.