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After GRUB went MIA I used boot-repair which returned this Boot-Repair Boot Info Script.

After that GRUB came back, but now after I choose the Ubuntu option in the boot menu nothing happens. If I go to Advanced and choose any of the kernels, nothing happens after loading initram.

Is there any way to repair this problem?

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1  1953525167   976762583+  ee  GPT
WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sdb: 32.0 GB, 32017047552 bytes
256 heads, 63 sectors/track, 3877 cylinders, total 62533296 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x63d41749
   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1  4294967295  2147483647+  ee  GPT
Disk /dev/mapper/ubuntu--vg-root: 991.2 GB, 991248252928 bytes
255 heads, 63 sectors/track, 120512 cylinders, total 1936031744 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition table
Disk /dev/mapper/ubuntu--vg-swap_1: 8451 MB, 8451522560 bytes
255 heads, 63 sectors/track, 1027 cylinders, total 16506880 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition table

ubuntu@ubuntu:/boot$ cat /etc/mtab
/cow / overlayfs rw 0 0
proc /proc proc rw,noexec,nosuid,nodev 0 0
sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0
udev /dev devtmpfs rw,mode=0755 0 0
devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0
tmpfs /run tmpfs rw,noexec,nosuid,size=10%,mode=0755 0 0
/dev/sr0 /cdrom iso9660 ro,noatime 0 0
/dev/loop0 /rofs squashfs ro,noatime 0 0
none /sys/fs/cgroup tmpfs rw 0 0
none /sys/fs/fuse/connections fusectl rw 0 0
none /sys/kernel/debug debugfs rw 0 0
none /sys/kernel/security securityfs rw 0 0
none /sys/firmware/efi/efivars efivarfs rw 0 0
tmpfs /tmp tmpfs rw,nosuid,nodev 0 0
none /run/lock tmpfs rw,noexec,nosuid,nodev,size=5242880 0 0
none /run/shm tmpfs rw,nosuid,nodev 0 0
none /run/user tmpfs rw,noexec,nosuid,nodev,size=104857600,mode=0755 0 0
none /sys/fs/pstore pstore rw 0 0
systemd /sys/fs/cgroup/systemd cgroup rw,noexec,nosuid,nodev,none,name=systemd 0 0
gvfsd-fuse /run/user/999/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,user=ubuntu 0 0
/dev/sda1 /mnt/boot-sav/sda1 vfat rw 0 0
/dev/sda2 /mnt/boot-sav/sda2 ext2 rw 0 0
/dev/sdb2 /mnt/boot-sav/sdb2 fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0
/dev/mapper/ubuntu--vg-root /mnt/boot-sav/mapper/ubuntu--vg-root ext4 rw 0 0

ubuntu@ubuntu:/boot$ sudo lvscan
  ACTIVE            '/dev/ubuntu-vg/root' [923.17 GiB] inherit
  ACTIVE            '/dev/ubuntu-vg/swap_1' [7.87 GiB] inherit
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