The following are some common troubleshooting issues:
Section 13.1, IPP Page Fails to Launch On Upgrading From OES 2015 SP1 to OES 2018 SP1
Section 13.4, Users Created with Admin Rights Do Not Have Full Rights
Section 13.6, ZLIB error during printer installation, profile creation, or upload
Section 13.11, iPrint Service Fails when Renaming a Volume Where iPrint Is Hosted
Section 13.12, Upgrading iPrint on a Cluster Does Not Upgrade the iPrint Clients
Section 13.13, iPrint LUM error when running the iprint_nss_relocate script
Section 13.14, Upgrading iPrint Does Not Update the ICM parameters of the iprint.ini file