Replace the previous multi-step APT retry sequence (mirror swaps, sleeps, multiple retries) with a simpler fallback: on apt-get update failure disable Acquire::By-Hash, enable Acquire::AllowInsecureRepositories and attempt updates/installs using --allow-insecure-repositories/--allow-unauthenticated where needed. Restore secure settings and refresh lists afterwards, and preserve/propagate the original command exit status. Apply the same simplification in misc/build.func, misc/install.func and the Proxmox LXC cron updater (tools/pve/update-lxcs-cron.sh) to handle Debian repo desyncs more reliably and reduce complex retry logic.
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