Eu finalmente encontrei a declaração umask 027
no meu arquivo ~/.profile
. Comentando e descomente umask 022
corrigiu.
~ / .profile
# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
# exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.
# the default umask is set in /etc/profile; for setting the umask
# for ssh logins, install and configure the libpam-umask package.
umask 022
# umask 027