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To see all available qualifiers, see our documentation.
Ubuntu is the default distribution in crouton.
If no release is specified, precise is installed (Ubuntu 12.04 LTS). quantal (12.10), raring (13.04) and saucy (13.10) are also supported.
precise
quantal
raring
saucy
See [https://github.com/dnschneid/crouton/wiki/Upgrade-chroot-release](upgrade chroot release) wiki page.