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Just install Ubuntu 18.04, when I run the command sudo apt update, it shows the below error:

sudo apt update
Hit:1 http://linux.teamviewer.com/deb stable InRelease
Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]    
Hit:3 http://sg.archive.ubuntu.com/ubuntu bionic InRelease                     
Get:4 http://sg.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]   
Get:5 http://sg.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Reading package lists... Done      
E: Release file for http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease is not valid yet (invalid for another 7h 31min 57s). Updates for this repository will not be applied.
E: Release file for http://sg.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease is not valid yet (invalid for another 7h 32min 53s). Updates for this repository will not be applied.
E: Release file for http://sg.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease is not valid yet (invalid for another 7h 34min 12s). Updates for this repository will not be applied.

Does any one know what causes this problem and how to resolve it?

Kevin Ling
  • 111
  • Check your system clock (and/or timezone). Your machine's date/time is set in the future ~7.5 hrs... You haven't worked out time travel have you? - wanna pass me some secrets? – guiverc Dec 11 '19 at 06:47
  • Well, got resolved by manually setting the timezone. thanks folks – Kevin Ling Dec 11 '19 at 06:52

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