| Problem | Solution | |---------|----------| | Windows update overwriting GRUB | Reinstall GRUB from Ubuntu Live USB ( grub-install /dev/sda --target=x86_64-efi ) | | FreeBSD not detected by os-prober | Manual entry in 40_custom (see above) | | Time sync issues between Windows (local time) and Linux/FreeBSD (UTC) | Windows registry change: RealTimeIsUniversal = 1 | | exFAT data partition mount errors | Install exfat-fuse (Linux) and exfat-utils (FreeBSD); mount via fstab | | Swap file conflict | Use dedicated swap partition; avoid hibernation across OSes |
Depending on your goal, the "final" setup usually followed one of these paths: Trying multi boot with Ventoy - cybercafe.dev multiboot hdd 2021 final