Comment 3 for bug 1608753

It's not just gcc that has mismatching versions. It's the whole toolchain.

The installed gcc package (according to dpkg) has version 4:5.3.1-1ubuntu1 while the /usr/bin/gcc symlink contained within is pointing to gcc-5.4.0. There is no trace of 5.3.1 binaries on the system, nor are there any available from the repos.

The bug will affect anyone who try to compile and/or link any kernel modules.