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/usr/lib/linux/4.18.0-15-generic/compiler is in linux-buildinfo-4.18.0-15-generic 4.18.0-15.16~18.04.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

1
GCC: (Ubuntu 7.3.0-16ubuntu3) 7.3.0