Same problem here. I'm using Brazilian mirrors. I tried to delete apt cache as some indicated, but it didn't worked.
Fetched 31,0 MB in 13s (2.281 kB/s) W: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/trusty/universe/binary-amd64/Packages Hash Sum mismatch
W: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/trusty/universe/binary-i386/Packages Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.
Same problem here. I'm using Brazilian mirrors.
I tried to delete apt cache as some indicated, but it didn't worked.
Fetched 31,0 MB in 13s (2.281 kB/s) br.archive. ubuntu. com/ubuntu/ dists/trusty/ universe/ binary- amd64/Packages Hash Sum mismatch
W: Failed to fetch http://
W: Failed to fetch http:// br.archive. ubuntu. com/ubuntu/ dists/trusty/ universe/ binary- i386/Packages Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.