/scripts/upcp --force stops

I would allow more time for the cPanel update (upcp) processes to complete. How much time has passed since you started the cPanel update? If you believe there is no activity occurring or if you suspect a problem you are welcome to submit a support request so that we may examine the situation.

 

Do not reboot only to kill processes without prior investigation and proper diagnosis

Cautionary Warning: Please do not restart or reboot the system merely because there is a running cPanel update (upcp) process; restarting the system should not be necessary. To ensure an issue is corrected the difficulty should be properly investigated and analyzed to allow for an accurate diagnosis.

I know of only a few rare circumstances where there may be a certain process that cannot be killed easily or terminated through normal methods, if I recall correctly once instance was related to file system disk quotas and specific to the OS-vendor-provided "repquota" utility, and only then -- if properly diagnosed -- may an issue necessitate a system restart, but I have never encountered an instance where a cPanel update (upcp) process could not be easily terminated with minimal effort (such as by using "kill" via console or root SSH access).