PHP Upgrade von 7.4 auf 8.X

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HowTo: Upgrade to Nextcloud 26 on Debian Bullseye

Preamble This HowTo does not apply to any Nextcloud container/VM/snap appliance, but is for bare metal installs on Debian Bullseye only! This HowTo was written with best efforts, but without guarantee. I cannot be held responsible for any damage to your system or data! Background Nextcloud 26 is about to be released on 2023-03-21, which drops support for PHP 7.4, the PHP version shipped by the current stable Debian Bullseye. The upcoming Debian Bookworm release is expected this summer, but …