Having looked more closely this bug was a result of user error; I did in fact repartition the installation device and had a separate partition for /boot/ which was also LUKS/dm_crypt. I had forgotten I needed to edit the /target/etc/default/grub whilst ubiquity was installing GRUB, and had to do it manually after ubiquity had completed.
This bug is about ubiquity actually *crashing* due to the package install failure rather than doing a clean error report and user-controlled quit.
For that reason I'm re-titling the bug so as not to distract from this bug reason with the mention of the GRUB_ENABLE_CRYPTODISK.
Having looked more closely this bug was a result of user error; I did in fact repartition the installation device and had a separate partition for /boot/ which was also LUKS/dm_crypt. I had forgotten I needed to edit the /target/ etc/default/ grub whilst ubiquity was installing GRUB, and had to do it manually after ubiquity had completed.
This bug is about ubiquity actually *crashing* due to the package install failure rather than doing a clean error report and user-controlled quit.
For that reason I'm re-titling the bug so as not to distract from this bug reason with the mention of the GRUB_ENABLE_ CRYPTODISK.