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I just start using rpi and quite a newbie

i run

sudo apt-get update

sudo apt-get upgrade

The update thing is successful, however , i cannot do the upgrade part, there are some package they fail to fetch It's said Failed to fetch http://mirror.nus.edu.sg with hash sum mismatch

I did some searching and found out that this mirror only limited in NUS campus. But how to change to other mirror, as i go to /etc/apt/sources.list. The url there is archive.raspbian.org which is nothing related to the NUS thing but my pi keep fetching from NUS mirror.

Please help

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Jake Lam
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  • Change the mirror like described here: https://raspberrypi.stackexchange.com/questions/27479/cannot-connect-to-mirrordirector-raspbian – Fabian Feb 21 '18 at 14:49
  • i cannot edit the sources.list file. its say cant open file to write. do you know why – Jake Lam Feb 22 '18 at 09:42

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