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Follow journal and show only entries with err priority

journalctl -p err -f

Valid priorities are (syslog):

• 0 emerg (panic / System is unusable)
• 1 alert (Action must be taken immediately / A condition that should be corrected immediately, such as a corrupted system database)
• 2 crit (Critical conditions / Hard device errors)
• 3 err (Error conditions)
• 4 warning (Warning conditions )
• 5 notice (Normal but significant conditions / Conditions that are not error conditions, but that may require special handling)
• 6 info (Informational messages)
• 7 debug