This is clearly a bug in ubiquity: It thinks it needs to re-read the partition table but won't be able to do so because a partition is mounted on that disk and then aborts the installation. But in fact, the partition table doesn't change at all, so it could just continue.
This is clearly a bug in ubiquity: It thinks it needs to re-read the partition table but won't be able to do so because a partition is mounted on that disk and then aborts the installation. But in fact, the partition table doesn't change at all, so it could just continue.