/usr/share/guile/1.8/srfi/ is in guile-1.8-libs 1.8.8+1-10ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/guile/1.8/srfi/srfi-1.scm
/usr/share/guile/1.8/srfi/srfi-10.scm
/usr/share/guile/1.8/srfi/srfi-11.scm
/usr/share/guile/1.8/srfi/srfi-13.scm
/usr/share/guile/1.8/srfi/srfi-14.scm
/usr/share/guile/1.8/srfi/srfi-16.scm
/usr/share/guile/1.8/srfi/srfi-17.scm
/usr/share/guile/1.8/srfi/srfi-19.scm
/usr/share/guile/1.8/srfi/srfi-2.scm
/usr/share/guile/1.8/srfi/srfi-26.scm
/usr/share/guile/1.8/srfi/srfi-31.scm
/usr/share/guile/1.8/srfi/srfi-34.scm
/usr/share/guile/1.8/srfi/srfi-35.scm
/usr/share/guile/1.8/srfi/srfi-37.scm
/usr/share/guile/1.8/srfi/srfi-39.scm
/usr/share/guile/1.8/srfi/srfi-4.scm
/usr/share/guile/1.8/srfi/srfi-6.scm
/usr/share/guile/1.8/srfi/srfi-60.scm
/usr/share/guile/1.8/srfi/srfi-69.scm
/usr/share/guile/1.8/srfi/srfi-8.scm
/usr/share/guile/1.8/srfi/srfi-88.scm
/usr/share/guile/1.8/srfi/srfi-9.scm