Dear Maintainer, Taking bug #922176 into account, it works well with the following code.
debian/ubuntu-keyring.postinst: line 5 ``` case "$1" in install|configure) TRUSTEDPARTS="/etc/apt/tusted.gpg.d/" eval "$(apt-config shell TRUSTEDPARTS Dir::Etc::trustedparts/d)" # purge old setting before package renaming # from ubuntu-archive-keyring to ubuntu-keyring if [ -d /usr/share/doc/ubuntu-archive-keyring ]; then rm -f "${TRUSTEDPARTS}ubuntu-archive-keyring.gpg" \ "${TRUSTEDPARTS}ubuntu-archive-removed-keys.gpg" fi . /usr/share/debconf/confmodule db_version 2.0 db_get ubuntu-keyring/keyring rm -f "${TRUSTEDPARTS}ubuntu-keyring-2018-archive.gpg" \ "${TRUSTEDPARTS}ubuntu-keyring-2012-archive.gpg" \ "${TRUSTEDPARTS}ubuntu-archive-removed-keys.gpg" if [ -n "$RET" ]; then selected=$(echo "$RET" | sed -e 's/, /\n/g') echo "$selected" | while read keyring do ln -sf "/usr/share/keyrings/${keyring}.gpg" "$TRUSTEDPARTS" done fi ``` Thank you, Hiroyuki YAMAMORI