Hi Team As decided by Sudan Government to change time zone from GMT+3 to GMT+2, we were testing TZ update from 2017b --> 2017c and we encountered the following error : Linux TZ version : 2017b --> 2017c ... Failed | "backzone", line 149: duplicate zone name Africa/Juba (file "africa", line 1107) | "backzone", line 150: input line of unknown type | "backzone", line 151: input line of unknown type On little debugging we found that in former version there was a link between Africa/Khartoum & Africa/Juba zones in africa file and Africa/Juba zone entry existed in "backzone" file but in later version same zone entry of Africa/Juba exists in both files ie "africa" & "backzone", causing trouble. Looking forward for an acknowledgement. Regards Sahil Sethi Sr Software Engineer GlogbalLogic, India