I have 64-bit dell N5110 laptop. During Ubuntu 14.04 installation, I received this error. I know the error is common, but I didn't find an answer, so please read below.
[Errno 5] Input/output error
This is often due to a faulty CD/DVD disk or drive, or a faulty hard disk. It may help to clean the CD/DVD, to burn the CD/DVD at a lower speed, to clean the CD/DVD drive lens (cleaning kits are often available from electronics suppliers), to check whether the hard disk is old and in need of replacement, or to move the system to a cooler environment.
I've had this error before, but back then I had problem with Ubuntu .iso file (checksum wasn't correct). However, this time the checksum is correct. Moreover, I used both Ubuntu (Start-up app) and Windows (Universal-USB-Installer) ways for making bootable usb. Both of them are giving me this error. If it means something, in "md5sum.txt" file on bootable usb the hash doesn't match with the correct on.
Any suggestions?