Nextcloud problems after update

[Shane_Treweek]

@gatto

unhandled exception has been thrown:
OCP\HintException: [0]: Memcache \OC\Memcache\APCu not available for local cache (Is the matching PHP module installed and enabled?)

I ran into this on my RPI I managed to fix it NextCloud Update how to Raspberry Pi - #2 by Shane_Treweek