I came across a similar error trying to downgrade from nvidia-331 to
nvidia-304 or trying to remove nvidia-331-updates while logged in to the
desktop.
Removing nvidia-331-updates (331.89-0ubuntu5) ...
stop: Unknown instance:
userdel: user nvidia-persistenced is currently used by process 1665
dpkg: error processing package nvidia-331-updates (--remove):
subprocess installed post-removal script returned error exit status 8
Errors were encountered while processing:
nvidia-331-updates
Rebooting and instead of logging in to the desktop, but pressing Ctrl-
Alt-F1 for a tty terminal, then logging in, allowed me to remove the 331
driver.
** Also affects: nvidia-graphics-drivers-331-updates (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1369398
Title:
package nvidia-331 331.89-0ubuntu4 failed to install/upgrade:
subprocess installed post-removal script returned error exit status 8
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