Ubuntu 14.04.4 – "Check for defects" – "Errors found in 2 files"

Question

First off...

First off, I've already searched Ask Ubuntu and found multiple other questions^{[1] [2] [3] [4]}, but a) most of them don't fully fit my circumstances, and b) the ones that do haven't been answered fully, if at all. So don't mark this as a duplicate because it's not one.

Now, then...

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The Question

I booted my computer to USB and it gave me the option to check the disk for defects. I did so, but it returned an error—on two separate occasions—saying "Errors found in 2 files".

The Details

• I tried this whole thing twice, both from the same ISO file^∗ and using Universal USB Installer, but across 2 USB flash drives.
• Both times I tested the MD5 hash using the official hash released by Ubuntu. Both times, the MD5 & SHA Checksum Utility cleared it as matching.

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Specs

• Make & Model: Lenovo G50
• Operating System: Windows 10 Home 64-Bit
• Prospective Distro: Ubuntu 14.04.4 LTS Desktop 64-Bit
• Flash Drive (1^st Attempt): Silicon Power USB 3.0 16 GB
• Flash Drive (2^nd Attempt): SanDisk Cruzer Blade USB 2.0 8 GB

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^∗ Thanks to 100 kb/s WiFi speeds, it takes 2–3 hours just to download the dang ISO file; so obviously I'm not gonna do it more than once unless I absolutely have to...

Answer 1

I had the same problem with Universal USB installer.

If checksums are correct, there must be a problem with the live usb creator.

After that I used Unetbootin (on Windows 7) and there weren't any errors anymore.

https://unetbootin.github.io/

Answer 2

In my case I also had this issue during Integrity check / Check for defects – Errors found in 2 files.

One of them was grub (https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1617721).

I didn't fix it, but workaround was to connect to the Internet and check Download updates during installation.