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I would like to set up an external hd from an existing Ubuntu on my internal hd:

  • partition 1 with Ubuntu Live,
  • an encrypted persistent partition 2
  • partition 3 with Ubuntu encrypted, installed from the live partition.

Partition 2 shall be usable after booting from partition 1 or 3.

When the hd is connected at boot time, a boot menu should appear offering the choice of booting from partition 1, from partition 3 after password entry, or from the internal hard disk.

What is the best way to proceed? Thanks.

noclue
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  • UEFI or BIOS install? External drives only boot from ESP if UEFI and /EFI/Boot/bootx64.efi. See this on install to external. Bug with work arounds for external drives. https://askubuntu.com/questions/16988/how-do-i-install-ubuntu-to-a-usb-key-without-using-startup-disk-creator I did not do encrypted install, but a full install and created an extra 6GB FAT32 partition and extracted ISO to it. When I moved boot,esp flags from ESP to FAT32 partition, making it ESP, then live installer booted. I normally boot ISOs directly from grub. I am sure you can boot extracted ISO from grub also. – oldfred Mar 15 '23 at 13:59

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