Ubuntu Server 16.10 USB integrity test failed

I downloaded ubuntu-16.10-server-amd64.iso and verified the SHA1-SUM.

I copied all files to my USB disk and tried to install it with UEFI boot; however, installation failed.

So I selected "check for defects" in the boot menu and surprisingly found `./pool/main/m/maas/python3-maas-provisioningserver_2.1.0~beta2+xbzr5454-0ubuntu1_all.deb` failed the MD5 check.

I tried the following:
* Checked for md5 of this file in Windows, it is correct.
* Loaded the ISO to a VMware machine and checked for defects, it showed that the check is success.
* Ran `cat ./pool/main/m/maas/python3-maas-provisioningserver_2.1.0~beta2+xbzr5454-0ubuntu1_all.deb | sha1sum` both in actual machine and VM, got the same result beginning with 6C2447E.
* I tried this in another computer and also with a different USB disk, but the problem remains.

I think this is a bug. Anyone can confirm this for me?