Comment 98 for bug 798414

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Ronny Ager-Wick (ronny-ager-wick) wrote : Re: update-initramfs should produce a more helpful error when there isn't enough free space

@dmcnutt
USB disks show up here just like other disks in "df", so that's normal.
/dev/dm-0 is most likely an encrypted partition. /boot cannot be in an encrypted partition because you need it for decryption. If the disk was just one big encrypted partition, you'd need to boot on a USB stick or something in order to decrypt it. If you install ubuntu on a disk using disk encryption (for example ext4), then you don't need to separate /boot on a separate partition.