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I'm a very long time ubuntu user (over a decade) but have not been here as I've had no issues with Ubuntu. With the arrival of 20.04 LTS I decided to encrypt my data (or system if needed). I'm looking for the following:

  • Method to reinstall ubuntu with LUKS encryption on a previous LUKS encrypted ubuntu install on a dual boot system with Win10.
  • Keep all my personal files (ie /home folder) intact, with or without a separate partition. I do not wish to move everything out, reinstall and then move stuff back in.
  • Simple GUI based approach through the standard installer. I know how to use the command line but I'd rather not, especially for something as sensitive as encryption.

What I'm looking for is basically the same as this document: (https://help.ubuntu.com/community/UbuntuReinstallation) except that I need it on an LUKS encrypted system/partition. I tried doing this on a spare system with 20.04, and I could not find a way of telling the installer the passphrase to the encrypted system. The end result was a reinstall that wouldn't boot or the encrypted partition gets wiped out. I also tried to run installer with and without pre-unlocking the encrypted partition but to no avail'.

I am able to do all of the above with Fedora,OpenSUSE,Manjaro, (although they only do this when /home is on separate partition, which is fine for me) so I'm not sure what I'm doing wrong in Ubuntu.

Thanks!

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Based on the my personal experiments using the Ubuntu 20.04 installer, online research, and asking various forums (and lack of answers there), I conclude that as of today, there is no way to do all of the following:

  • Installing/reinstalling Ubuntu ...
  • using the installer GUI ...
  • on a pre-encrypted system (LUKS, with separate /home partition or not) without destroying pre-existing personal files...
  • with dual booting another OS.

Of course there are ways of doing this if you rely on the command line, which I was looking to avoid. I've decided to switch to Fedora 32 as it meets all these requirements. Ubuntu served me rather well for over a decade, hope to return when the above issue is fixed.

For those interested in my Fedora 32 setup:

  • Dual-boot setup with Windows 10.
  • Reuse (DO NOT FORMAT) /boot/efi partition from Windows 10 install
  • Create UNENCRYPTED /boot partition
  • Create/Reuse ENCRYPTED / partition
  • Create/Reuse ENCRYPTED /home partition
  • Provide Passphrase to unlock above encrypted partitions.
  • Post install, added RPMFusion repository and Gnome Tweaks extension

Thats the summary, its been a week and so far things have been great with Fedora 32. I've not really noticed much difference from Ubuntu for my needs (Email, Browsing, viewing photos/videos, music, skype, spreadsheets, documents).

Thanks!

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