**********************************************
Found invalid GPT and valid MBR; converting MBR to GPT format
in memory.
***************************************************************

Disk /dev/sda: 625076912 sectors, 298.1 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): C59CE4D8-20CB-4228-9624-84358CE612F9
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 625076878
Partitions will be aligned on 2048-sector boundaries
Total free space is 8841837 sectors (4.2 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1         1050624       617285631   293.8 GiB   8300  Linux filesystem
root@ubuntu:/media/ubuntu# mount /dev/sda1 /mnt
root@ubuntu:/media/ubuntu# for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
root@ubuntu:/media/ubuntu# chroot /mnt
root@ubuntu:/# grub-install --recheck /dev/sda
grub-install: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
root@ubuntu:/# ls /boot
abi-3.19.0-25-generic     efi                           memtest86+.elf                vmlinuz-3.19.0-28-generic
abi-3.19.0-28-generic     grub                          memtest86+_multiboot.bin      vmlinuz-3.19.0-28-generic.efi.signed
abi-3.19.0-58-generic     initrd.img-3.19.0-25-generic  System.map-3.19.0-25-generic  vmlinuz-3.19.0-58-generic
config-3.19.0-25-generic  initrd.img-3.19.0-28-generic  System.map-3.19.0-28-generic  vmlinuz-3.19.0-58-generic.efi.signed
config-3.19.0-28-generic  initrd.img-3.19.0-58-generic  System.map-3.19.0-58-generic
config-3.19.0-58-generic  memtest86+.bin                vmlinuz-3.19.0-25-generic
root@ubuntu:/# ls /boot |pastebinit
http://paste.ubuntu.com/16187470/
root@ubuntu:/# dpkg -l | grep grub | nc termbin.com 9999
http://termbin.com/ghg9
root@ubuntu:/# parted -l | nc termbin.com 9999
http://termbin.com/70cz
root@ubuntu:/# cat /etc/fstab | nc termbin.com 9999
http://termbin.com/ii1c
root@ubuntu:/# blkid | nc termbin.com 9999
http://termbin.com/pjbb
root@ubuntu:/# cgdisk /dev/sda
root@ubuntu:/# partprobe
Warning: /dev/sdb contains GPT signatures, indicating that it has a GPT table.  However, it does not have a valid fake msdos partition table, as it should.  Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables.  Or perhaps you deleted the GPT table, and are now using an msdos partition table.  Is this a GPT partition table?
Error: Both the primary and backup GPT tables are corrupt.  Try making a fresh table, and using Parted's rescue feature to recover partitions.
root@ubuntu:/# gdisk -l /dev/sda
GPT fdisk (gdisk) version 0.8.8

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 625076912 sectors, 298.1 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): CEB309BF-3648-4FD2-856E-F3B203166BC1
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 625076878
Partitions will be aligned on 2048-sector boundaries
Total free space is 7793261 sectors (3.7 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1         1050624       617285631   293.8 GiB   8300  Linux filesystem
   2            2048         1050623   512.0 MiB   EF00  die
root@ubuntu:/# gdisk -l /dev/sda | nc termbin.com 9999
http://termbin.com/8cb8
root@ubuntu:/# blkid /dev/sda2
/dev/sda2: UUID="0920-6243" TYPE="vfat"
root@ubuntu:/# mount -a
mount: special device UUID=56948039-22f2-47f1-b0b9-be84f0d271f7 does not exist
root@ubuntu:/# ls /boot
abi-3.19.0-25-generic     efi                           memtest86+.elf                vmlinuz-3.19.0-28-generic
abi-3.19.0-28-generic     grub                          memtest86+_multiboot.bin      vmlinuz-3.19.0-28-generic.efi.signed
abi-3.19.0-58-generic     initrd.img-3.19.0-25-generic  System.map-3.19.0-25-generic  vmlinuz-3.19.0-58-generic
config-3.19.0-25-generic  initrd.img-3.19.0-28-generic  System.map-3.19.0-28-generic  vmlinuz-3.19.0-58-generic.efi.signed
config-3.19.0-28-generic  initrd.img-3.19.0-58-generic  System.map-3.19.0-58-generic
config-3.19.0-58-generic  memtest86+.bin                vmlinuz-3.19.0-25-generic
root@ubuntu:/# ls /boot/efi
EFI
root@ubuntu:/# ls /boot/efi/efi
ubuntu
root@ubuntu:/# ls /boot/efi/efi/ubuntu/
grub.cfg  grubx64.efi  MokManager.efi  shimx64.efi
root@ubuntu:/# dpkg -l | awk '$2 ~ /grub/ {print $2}' | xargs apt-get install --reinstall
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libgsoap4 libp11-kit-gnome-keyring:i386 linux-image-3.19.0-25-generic
  linux-image-extra-3.19.0-25-generic owncloud-3rdparty owncloud-app-activity
  owncloud-app-encryption owncloud-app-external owncloud-app-files
  owncloud-app-files-external owncloud-app-files-locking
  owncloud-app-files-pdfviewer owncloud-app-files-sharing
  owncloud-app-files-texteditor owncloud-app-files-trashbin
  owncloud-app-files-versions owncloud-app-files-videoviewer
  owncloud-app-firstrunwizard owncloud-app-gallery
  owncloud-app-provisioning-api owncloud-app-templateeditor
  owncloud-app-user-external owncloud-app-user-ldap
  owncloud-app-user-webdavauth wine-gecko2.21 wine-gecko2.21:i386
  wine-mono0.0.8
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 5 reinstalled, 0 to remove and 79 not upgraded.
Need to get 0 B/3,118 kB of archives.
After this operation, 0 B of additional disk space will be used.
Preconfiguring packages ...
(Reading database ... 296498 files and directories currently installed.)
Preparing to unpack .../grub-common_2.02~beta2-9ubuntu1.7_amd64.deb ...
Unpacking grub-common (2.02~beta2-9ubuntu1.7) over (2.02~beta2-9ubuntu1.7) ...
Preparing to unpack .../grub-efi-amd64-signed_1.34.8+2.02~beta2-9ubuntu1.7_amd64.deb ...
Unpacking grub-efi-amd64-signed (1.34.8+2.02~beta2-9ubuntu1.7) over (1.34.8+2.02~beta2-9ubuntu1.7) ...
Preparing to unpack .../grub2-common_2.02~beta2-9ubuntu1.7_amd64.deb ...
Unpacking grub2-common (2.02~beta2-9ubuntu1.7) over (2.02~beta2-9ubuntu1.7) ...
Preparing to unpack .../grub-efi-amd64_2.02~beta2-9ubuntu1.7_amd64.deb ...
Unpacking grub-efi-amd64 (2.02~beta2-9ubuntu1.7) over (2.02~beta2-9ubuntu1.7) ...
Preparing to unpack .../grub-efi-amd64-bin_2.02~beta2-9ubuntu1.7_amd64.deb ...
Unpacking grub-efi-amd64-bin (2.02~beta2-9ubuntu1.7) over (2.02~beta2-9ubuntu1.7) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Processing triggers for ureadahead (0.100.0-16) ...
ureadahead will be reprofiled on next reboot
Processing triggers for install-info (5.2.0.dfsg.1-2) ...
Setting up grub-common (2.02~beta2-9ubuntu1.7) ...
Setting up grub2-common (2.02~beta2-9ubuntu1.7) ...
Setting up grub-efi-amd64-bin (2.02~beta2-9ubuntu1.7) ...
Setting up grub-efi-amd64 (2.02~beta2-9ubuntu1.7) ...
Installing for x86_64-efi platform.
Fatal: Couldn't open either sysfs or procfs directories for accessing EFI variables.
Try 'modprobe efivars' as root.
Fatal: Couldn't open either sysfs or procfs directories for accessing EFI variables.
Try 'modprobe efivars' as root.
Installation finished. No error reported.
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.19.0-58-generic
Found initrd image: /boot/initrd.img-3.19.0-58-generic
Found linux image: /boot/vmlinuz-3.19.0-28-generic
Found initrd image: /boot/initrd.img-3.19.0-28-generic
Found linux image: /boot/vmlinuz-3.19.0-25-generic
Found initrd image: /boot/initrd.img-3.19.0-25-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
grub-probe: error: cannot find a GRUB drive for /dev/sdb1.  Check your device.map.
done
Setting up grub-efi-amd64-signed (1.34.8+2.02~beta2-9ubuntu1.7) ...
grub-install: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@ubuntu:/#