/usr/share/gnucash/accounts/nb/ is in gnucash-common 1:2.6.15-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gnucash/accounts/nb/acctchrt_brokerage.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_business.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_carloan.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_cdmoneymkt.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_checkbook.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_childcare.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_common.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_eduloan.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_fixedassets.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_full.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_homeloan.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_homeown.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_otherloan.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_renter.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_retiremt.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_spouseinc.gnucash-xea
/usr/share/gnucash/accounts/nb/acctchrt_spouseretire.gnucash-xea