/usr/share/avogadro/fragments/heteroaromatics/ is in avogadro-data 1.0.3-1ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/avogadro/fragments/heteroaromatics/1H-indole.cml
/usr/share/avogadro/fragments/heteroaromatics/1H-pyrazole.cml
/usr/share/avogadro/fragments/heteroaromatics/1H-pyrrole.cml
/usr/share/avogadro/fragments/heteroaromatics/1_2-oxazole.cml
/usr/share/avogadro/fragments/heteroaromatics/1_2-thiazole.cml
/usr/share/avogadro/fragments/heteroaromatics/1_3-oxazole.cml
/usr/share/avogadro/fragments/heteroaromatics/1_3-thiazole.cml
/usr/share/avogadro/fragments/heteroaromatics/benzofuran.cml
/usr/share/avogadro/fragments/heteroaromatics/benzothiophene.cml
/usr/share/avogadro/fragments/heteroaromatics/furan.cml
/usr/share/avogadro/fragments/heteroaromatics/pyridine.cml
/usr/share/avogadro/fragments/heteroaromatics/thiophene.cml