- Add an APT-only “Held updates” view while keeping held packages excluded from normal and scheduled updates.
- Allow administrators to hold or unhold packages from package details.
- Allow explicitly selected held packages to be updated once, then restore all existing package holds.
- Preserve configured `aptitude` behavior for regular installs while using `apt-get` for the held-package override.
Fixes#2689
ⓘ Normalize APT install-result names like `libtinfo6:amd64` to `libtinfo6` so scheduled updates can correctly detect dependency-updated packages and avoid false failure reports.
https://github.com/virtualmin/virtualmin-gpl/issues/1247
