/usr/lib/x86_64-linux-gnu/pkgconfig/ext2fs.pc is in e2fslibs-dev 1.42.9-3ubuntu1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: ext2fs
Description: Ext2fs library
Version: 1.42.9
Requires.private: com_err
Cflags: -I${includedir}/ext2fs -I${includedir}
Libs: -L${libdir} -lext2fs
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