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post_install() { post_upgrade $1 0 getent group cdemu &>/dev/null || groupadd -r cdemu } post_upgrade() { _EXTRAMODULES=extramodules-4.11 depmod "$(cat /usr/lib/modules/$_EXTRAMODULES/version)" >/dev/null 2>&1 } post_remove() { post_upgrade $1 0 groupdel cdemu }