I have the same problem on a Lenovo Thinkpad E125 as well.
Assuming the uefi and root partitions are /dev/sda1 and /dev/sda2
respectively, the following helped in the case of Lenovo, but did not help
in case of Asus Eee PC 1215B :
boot in UEFI the 18.04.1 pen,
continue in "try" mode and then in a terminal after "sudo -s"
mount "/dev/sda2 /mnt
mkdir --parents /mnt/boot/efi
mount "/dev/sda1 /mnt/boot/efi
for x in dev dev/pts proc sys ; do
mount -B /$x /mnt/$x
done
modprobe efivars
apt-get install --reinstall grub-efi-amd64-signed
grub-install --no-nvram --root-directory=/mnt
chroot /mnt update-grub
cd /mnt/boot/efi/EFI
cp -R ubuntu/* BOOT/
cd BOOT
cp grubx64.efi bootx64.efi
In case of Asus 1215B the following did help:
boot in UEFI the 18.04.1 pen,
continue in "try" mode and then in a terminal after "sudo -s"
add-apt-repository ppa:yannubuntu/boot-repair
apt-get update
apt-get install -y boot-repair
boot-repair
Now the both old (2011 = early UEFI) laptops boot 18.04 in UEFI mode.
It would be nice, if the 18.04 install media would have this fairly
universal, not really laptop-specific knowledge, ... what I learned from
various internet resources.
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https://bugs.launchpad.net/bugs/1787916
Title:
18.04 erasing all reinstall on uefi fails to install the boot loader
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