This looks like the image you're using the install may be incomplete or
damaged:
May 5 13:46:10 ubuntu ubiquity: E: Failed to fetch cdrom://Ubuntu 15.04
_Vivid Vervet_ - Release amd64 (20150422)/pool/main/g/grub2/grub-efi-
amd64-bin_2.02~beta2-22ubuntu1_amd64.deb Hash Sum mismatch
Could you try to verify the image you downloaded with md5sum, download
it again if it's incomplete, and try again?
** Changed in: grub-installer (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1451841
Title:
Install fails with ESP and Ext4 partition
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