Using Live_USB with reinstall option can fix the dependencies errors, even there was a grub2 error. After I reboot system, the grub2 error with shim-signed and grub-efi-amd64-signed errors. I use `sudo apt install grub-pc` to solve the shim-signed error, and I found x86_64-efi directory's name changed to i386-pc. And then I use the following solution to fixed the grub-refi-amd64-signed error: ``` sudo mount /dev/sda5 /mnt # 把root分区挂在/mnt目录，你可以通过ll /mnt查看其内容应该与ll /显示的是一样的内容 sudo mount /dev/sda1 /mnt/boot/efi # 挂在efi分区到引导目录中，挂在这一步你可以对比ll /mnt/boot/efi挂在前后的区别
sudo mount --bind /dev /mnt/dev sudo mount --bind /proc /mnt/proc sudo mount --bind /sys /mnt/sys sudo chroot /mnt apt-get install grub-efi-amd64 grub-install --recheck --no-floppy --force echo "configfile (hd0,gpt#)/boot/grub.cfg" > /boot/efi/ubuntu/grub.cfg # 告诉grub从/boot加载grub.cfg update-grub # 建立grub菜单列表 exit # 退出chroot模式 ### 卸载挂在分区 ### sudo umount /mnt/dev sudo umount /mnt/proc sudo umount /mnt/sys sudo umount /mnt/boot/efi sudo umount /mnt/boot ``` After those two processing, there is no errors about efi. Maybe there are some bugs in auto-upgrading from 16.04 LTS to 18.04 LTS. So I met some errors with `apt` method for upgrading. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1768695 Title: package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1768695/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
