... if [ -n "$preversion" ] && dpkg --compare-versions "$preversion" lt 2.31-0ubuntu2; then LCONFIG_NOTRIGGER=y export LDCONFIG_NOTRIGGER ldconfig || ldconfig --verbose ...
... NOTRIGGER= y
if [ -n "$preversion" ] && dpkg --compare-versions "$preversion" lt 2.31-0ubuntu2; then
LCONFIG_
export LDCONFIG_NOTRIGGER
ldconfig || ldconfig --verbose
...