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Here's a screenshot of my situation. I've clicked off all the repos and tried sudo apt-get update but I still receive: 

E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial/main/binary-armhf/Packages  404  Not Found [IP: 91.189.91.23 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-armhf/Packages  404  Not Found [IP: 91.189.91.23 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-armhf/Packages  404  Not Found [IP: 91.189.91.23 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/main/binary-armhf/Packages  404  Not Found [IP: 91.189.88.161 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

I tried the suggestions in this thread and only made it through the second one. I think it disabled the main software repos for me. I enabled them and now I still have the same problem and can't install apps. In Ubuntu Software Center, I tried installing Krusader and nothing happened. When I type terminal commands,

sudo apt-get update
sudo apt-get install krusader

this is what happens:

sudo apt-get install krusader
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package krusader

Any ideas? Thanks.

CapR
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    Is your network ok? – George Udosen Nov 26 '17 at 06:47
  • I can browse the internet just fine. I haven't had issues downloading and installing apps in the past. This issue only occurred in the last few weeks I think. EDIT: I'm connected by wifi and ethernet cable to an access point but it's been that way for years. – CapR Nov 26 '17 at 08:19
  • Have you tried to edit your sources.list and change the location for example like

    http://(Change this to another geography location)/ubuntu/dists/xenial-backports/main/binary-armhf/Packages

    in my case: http://mirror.0x.sg - Singapore find the location that is not very far from your location

    then run sudo apt-get update see if it works for you

     – Yien Nov 26 '17 at 11:03
  • I went to Software & Updates > Ubuntu software> and found/selected the closest server. Nothing changed. Maybe it really is my local network? – CapR Nov 26 '17 at 16:09
  • If it means anything, I installed Gufw Firewall several months ago. It's been disabled this entire time though. – CapR Nov 26 '17 at 17:26

1 Answers1

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I had similar issues like this, couldn't fetch files from the Ubuntu server, this might help it worked with me, Go to software & updates > Ubuntu software> Re choose the closest server. Now Try sudo apt-get update

Ronald Tudu
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