$ apt-cache policy gcc-4.9-base
gcc-4.9-base:
Installed: 4.9.3-0ubuntu4
Candidate: 4.9.3-0ubuntu4
Version table:
*** 4.9.3-0ubuntu4 0
100 /var/lib/dpkg/status
4.9.2-10ubuntu13 0
500 http://us.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
$
The version of libstdc++6 in vivid comes from gcc-4.9 source. There has
been an SRU of gccgo-4.9 to trusty, which requires it to build a
gcc-4.9-base package, whose version number is higher in trusty than in
vivid; and libstdc++6 requires the matching version of gcc-4.9-base.
This prevents upgrading anything that depends on libstdc++6.
This problem is specific to upgrades between trusty and vivid;
libstdc++6 in wily is built from gcc 5 so depends on gcc-5-base instead
of gcc-4.9-base, removing the problem.
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https://bugs.launchpad.net/bugs/1534374
Title:
unable to upgrade beyond 14.04
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