403 Forbidden error in sudo apt-get upgrade ubuntu 17.4

Question

Err:1 http://us.archive.ubuntu.com/ubuntu zesty-updates/main amd64 libqt5test5 amd64 5.7.1+dfsg-2ubuntu4~1.17.04.1
  403  Forbidden [IP: 91.189.91.26 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/q/qtbase-opensource-src/libqt5test5_5.7.1+dfsg-2ubuntu4~1.17.04.1_amd64.deb  403  Forbidden [IP: 91.189.91.26 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Answer 1

Yesterday I experienced the same problem with the bg. mirror on my 2 computers with Ubuntu. I tried to open http://bg.archive.ubuntu.com from the browser and received an error. Then I tried http://archive.ubuntu.com and I saw it's working.

So the solution was temporary switching from the local repository bg.archive.ubuntu.com to the central repository archive.ubuntu.com by editing of the file /etc/apt/sources.list. You can do this from the command line by using sed command in this way:

sudo sed 's/bg.archive.ubuntu.com/archive.ubuntu.com/g' /etc/apt/sources.list -i.bak

Later you can restore the original state by the command:

sudo mv /etc/apt/sources.list.bak /etc/apt/sources.list

Answer 2

I have gotten that problem before and it was the Firewall/Content Filtering appliance that was blocking access to some of my repo addresses. Not sure if that is a possibility for you.

I whitelisted my linux host on the Firewall/Content Filtering appliance so that it would have unrestricted access outbound.