I had a similiar issue, I tried so many things and this simple command fixed it
apt-get update --fix-missing
Type: Posts; User: Raid
I had a similiar issue, I tried so many things and this simple command fixed it
apt-get update --fix-missing
So now are you trying to boot from the USB pen drive or the hard drive? And is the hard drive external or internal?
Are you dual booting?
Depending on that you want to check if your installs are on...