/usr/share/horde/nag/migration/ is in php-horde-nag 4.2.17-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/horde/nag/migration/10_nag_upgrade_categoriestotags.php
/usr/share/horde/nag/migration/11_nag_upgrade_smartlists.php
/usr/share/horde/nag/migration/12_nag_fix_smartlists.php
/usr/share/horde/nag/migration/13_nag_upgrade_parents.php
/usr/share/horde/nag/migration/14_nag_upgrade_search.php
/usr/share/horde/nag/migration/1_nag_base_tables.php
/usr/share/horde/nag/migration/2_nag_upgrade_autoincrement.php
/usr/share/horde/nag/migration/3_nag_upgrade_addalarmmethods.php
/usr/share/horde/nag/migration/4_nag_upgrade_addcolor.php
/usr/share/horde/nag/migration/5_nag_upgrade_systemshares.php
/usr/share/horde/nag/migration/6_nag_upgrade_sqlng.php
/usr/share/horde/nag/migration/7_nag_upgrade_sqlhierarchical.php
/usr/share/horde/nag/migration/8_nag_upgrade_sqlnghierarchical.php
/usr/share/horde/nag/migration/9_nag_upgrade_recurrence.php