[Expired for grub-installer (Ubuntu) because there has been no activity
for 60 days.]
** Changed in: grub-installer (Ubuntu)
Status: Incomplete => Expired
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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
