🔧 Fixed: Proxmox "Release file expired" Error

Just hit this today updating Proxmox:

Error: Release file for http://ftp.no.debian.org/debian/dists/bookworm-updates/InRelease is expired (invalid since 4d 7h 28min 10s)

First thought: Time server issue. Checked - nope, time was correct.

Solution: Change Debian mirror from country-specific to main.

In /etc/apt/sources.list:

Changed FROM:

deb http://ftp.no.debian.org/debian bookworm main contrib

deb http://ftp.no.debian.org/debian bookworm-updates main contrib

Changed TO:

deb http://deb.debian.org/debian bookworm main contrib

deb http://deb.debian.org/debian bookworm-updates main contrib

Then: apt-get update worked fine.

Root cause: Norwegian mirror was out of sync. Main Debian mirror is more reliable.

Hit this error? Try switching to the main mirror.

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