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I setup my system with btrfs as root file system to be able to install additional Linux systems later on (each with separate and small /boot partition) on separate subvolumes.

Then I light-heartedly migrated everything to bcache, when I bought my SSD drive.

Now I'd like to install Ubuntu on it, without sacrificing the previous one.

Unfortunately none livedvd supports bcache, so they will never recognize my target btrfs root partition.

Is it still possible to do that? I guess the alternate DVD installer might help, but it doesn't support bcache either.

Or maybe it is possible to generate my own ubuntu-installer dvd with bcache modules installed. If so, how to do that?

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Install the bcache tools on the livecd? –  psusi Mar 28 at 13:30
    
That would solve the problem. I don't have any expertise in mastering livedvds, but I'll look into it. –  Adam Ryczkowski Mar 28 at 17:37
    
You don't need to "master" anything.. you just use apt-get install just like you did when you set up bcache the first time. –  psusi Mar 28 at 18:42
    
@psusi bcache doesn't work until you reboot - it needs to add a kernel module. So you need modify the dvd in a way that survives reboots. –  Adam Ryczkowski Mar 28 at 19:59
    
You don't have to reboot to load a module. –  psusi Mar 28 at 20:17

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