While upgrading using do-release from ubuntu 14.04 to ubuntu 16.04,I encountered the problems mentioned in apt: relocation error: version GLIBCXX_3.4.21 not defined in file libstdc++.so.6 with link time reference so while doing the methods given in the above question,I am encountering the following problems
dpkg: error processing package libstdc++6:amd64 (--install):
package libstdc++6:amd64 5.4.0-6ubuntu1~16.04.9 cannot be configured
because libstdc++6:i386 is at a different version (7.2.0-
1ubuntu1~14.04)
Processing triggers for libc-bin (2.23-0ubuntu10) ...
Errors were encountered while processing:
libstdc++6:amd64
