Your installation medium contains a mix of both trusty and wily. You
need to format a USB stick before reusing it for another distro/release.
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1518146
Title:
Failed installation Ubuntu 14.04.3 on Acer E5-573g grub-efi-
amd64-signed package could't be installed
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