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If you are getting the below error while switching the user,
su: cannot set user id: Resource temporarily unavailable
You can solve the issue by editing the file limit.conf.
Now edit the values you seen in the file as below,
* soft nproc 2047 * hard nproc 16384 * soft nofile 2048 * hard nofile 65536
Now try to re login as normal user and try switching as super user.
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