*** This bug is a duplicate of bug 1767703 ***
https://bugs.launchpad.net/bugs/1767703
Thank you.
Actually I solved the problem using an older version of Lubuntu.
I don't know what was the problem but it works perfectly now.
2018-05-03 10:32 GMT+03:00 dino99 <1768...@bugs.launchpad.net>:
*** This bug is a duplicate of bug 1767703 ***
https://bugs.launchpad.net/bugs/1767703
** This bug has been marked a duplicate of bug 1767703
Calling 'apt-install grub-efi-amd64-signed' failed
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Bugs, which is