Note: Initial bug report was made under 12.10, but the following retest
performed under 14.04.1.

We seem to have a couple of different problems, both indicating a lack
of IPv6 support.

1) Scanner detection over the network is performed with BJNP, and the 
specification seems to be tied to using IPv4 broadcast.
2) Manual specification of the scanner in the backend configuration is 
unsuccessful:

kjotte@daedalus:~$ cat /etc/sane.d/pixma.conf 
# pixma.conf configuration for the sane pixma backend
#
# define URI's of scanners (one per line)
# This is only used for network scanners.
# normally scanners will be detected by sending a broadcast
# if this does not work under your OS, or if the scanners
# are on a different subnet, configure your scanners URI here
#
# method must be bjnp
# port number can normally be left out, port 8612 is used as default
# Example:
# bjnp://myscanner.my.domain:8612
# bjnp://printer-1.pheasant.org
#
bjnp://gonzo.mibloving.net

kjotte@daedalus:~$ scanimage -L
[pixma] Cannot resolve hostname: gonzo.mibloving.net

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
kjotte@daedalus:~$ host gonzo.mibloving.net
gonzo.mibloving.net has IPv6 address 2001:470:8:f04:8a87:17ff:fe3b:fe0d

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https://bugs.launchpad.net/bugs/1160650

Title:
  cannot detect IPv6 scanner

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