*** This bug is a duplicate of bug 1596230 ***
https://bugs.launchpad.net/bugs/1596230
The error in your log is:
Installing for x86_64-efi platform.
grub-install: error: cannot open `/boot/efi/EFI/ubuntu/shimx64.efi': Read-only
file system.
Failed: grub-install --target=x86_64-efi
Your ESP must be mounted at /boot/efi and must be mounted read-write in
order to upgrade the bootloader.
** This bug has been marked a duplicate of bug 1596230
installer produces unhelpful error message when /boot/efi is mounted
read-only
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https://bugs.launchpad.net/bugs/1683221
Title:
package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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