Error with boot repair

I started boot repair system because I wanted to recovery grub. After some steps It wrote to writethis commands in terminal: sudo chroot «/mnt/boot-sav/sda2» dpkg --configure -a sudo chroot «/mnt/boot-sav/sda2» apt-get install -fy sudo chroot «/mnt/boot-sav/sda2» apt-get purge -y grub*-common grub-common:i386 shim-signed after last command it saw: bash: /EFI/Boot/bootx64.efi: No such file or directory lubuntu@lubuntu:~$ Unable to locate package grub-common:i386 Please help me