downloaded extension pack not stored?

Control: severity -1 normal

Ok, looking at postinst [0], it seems that the message

“The file will be downloaded into /usr/share/virtualbox-ext-pack”

misled me, as it seems, as line 31 rm it after installing it…

May I suggeset to remove that line, and while on it fixing #908897 to
use a more FSH compliant path (/usr might not be writeable…)

[0] salsa.debian.org/pkg-virtualbox-team/virtualbox-ext-pack/-/blob/master/debian/postinst.in#L27

—
Cheers,
tobi