Please excuse, that I did not got to a workaround before reporting this bug.
It is indeed possible to have a custom partition layout with the ubiquity installer on the KDE Live CD, when the layout is created manually. If the deisred root ("/") filesystem is btrfs it needs to be completely fresh or created by the installer. The reason for the issue seems to be that I had a custom subvolume ("sv_root") and that I set that subvolume as the default subvolume to mount. Whereas the installer wants to use a subvolume named "@" as the system's root. There seems to be no way to deviate from this during installation. I perfectly understand that names are a question of taste. Yet there is no reason to not support custom subvolume names. To get a working system: * Do not select updates/extras * Open manually created LVM/dm-crypt volumes * Select your volumes - choose to format your /boot-device and the device containing / * Install * The installer crashes when it needs to install the bootloader (at least it looks that way) * Quit the installer * Mount the target into /target with dev, dev/pts, proc, sys, boot; this needs to match the planned layout, which will be put in fstab and crypttab, *EXACTLY* * Add /etc/crypttab to reflect the crypted devices correctly * Edit /etc/fstab to reflect the system correctly * Create /etc/initramfs-tools/conf.d/cryptroot file; this is the step I missed at first * update-initramfs -u -k all * update-grub * Unmount everything * reboot Thank you for taking the time to read this report. Please forgive my grammar, since I am not a native speaker. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1409865 Title: Ubiquity installer crashes with manual partition layout - looks like a regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1409865/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs