I just upgraded to Ubuntu xenial, 16.04. When I try to do apt-get, I get the error
apt-get: relocation error: /usr/lib/i386-linux-gnu/libapt-pkg.so.5.0: symbol [long symbol omitted] version GLIBCXX_3.4.21 not defined in file libstdc++.so.6 with link time reference
wget http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/libstdc++6_5.4.0-6ubuntu1~16.04.10_amd64.deb sudo dpkg -i libstdc++6_5.4.0-6ubuntu1~16.04.10_amd64.deb
but the system complains this is going back to an old version of libstdc++6:
dkpg: warning: downgrading libstdc++6:i386 from 8.1.0-5ubuntu1!14.04 to 5.4.0-6ubuntu~16.04.10
and refuses to continue because
libstdc++6:i386 break libkolabxml1.
That page also suggests using
ppa-purge (but it's not installed) and
apt isn't working).
I have also tried installing
aptitude itself, the xenial version for i386. It complains that it needs
libsigc++-2.0-0v5. But it can't install these because it breaks dependencies if it tries.
When I've run across a mess of dependencies like this before, it turned out I had something at the top level that was of the wrong sort.
What's the fix? I'd imagine if I can get
apt working, I can get other things repaired. I'd be willing to run the upgrade process again, but
do-release-upgrade fails because it can't use
Some further requested detail.
dpkg --print-foreign-architecture: [no output]
ldd /usr/lib/i386-linux-gnu/libapt-pkg.so.5.0 | grep local: [no output]
ldd /usr/lib/i386-linux-gnu/libstdc++.so.6 | grep local: [no output]