Comment 77 for bug 1268257

When I try to run

sudo apt-get install nvidia-331-uvm --reinstall

as recommended above, I get this result:

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  libcuda1-331 nvidia-331 nvidia-opencl-icd-331
The following packages will be REMOVED:
  nvidia-331-updates
The following NEW packages will be installed:
  libcuda1-331 nvidia-331 nvidia-331-uvm nvidia-opencl-icd-331
0 upgraded, 4 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0 B/53.2 MB of archives.
After this operation, 54.3 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
(Reading database ... 501203 files and directories currently installed.)
Removing nvidia-331-updates (331.113-0ubuntu0.1) ...
stop: Unknown instance:
userdel: user nvidia-persistenced is currently used by process 2076
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
E: Sub-process /usr/bin/dpkg returned an error code (1)

How can I address this?