Вернуть установщик Ubuntu в grub

sudo mount /dev/sda2 /mnt
ls /mnt
df /mnt

ubuntu@ubuntu:~$ sudo mount /dev/sda2 /mnt
 
ubuntu@ubuntu:~$ ls /mnt
boot          dists                  install     pool
boot.catalog  efi                    kernel      prepackage.dell
casper        factory                md5sum.txt  preseed
debs          glibc_security_update  mesa        scripts
 
 
ubuntu@ubuntu:~$ df /mnt
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda2        3137536 2140820    996716  69% /mnt

sudo grub-mkconfig

ubuntu@ubuntu:~$ sudo grub-mkconfig
/usr/sbin/grub-probe: error: failed to get canonical path of `/cow'.

sudo blkid
cat /mnt/boot/grub/grub.cfg

ubuntu@ubuntu:~$ sudo blkid
 
/dev/sda1: LABEL="ESP" UUID="3457-697A" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="463b8af8-543d-4444-a188-3db200f53c7d"
/dev/sda2: LABEL="OS" UUID="7616-6BAF" TYPE="vfat" PARTLABEL="Basic data partition" PARTUUID="a1b59131-aabf-44b0-83f3-f0aa52840bad"
/dev/sda3: UUID="3753-0B9B" TYPE="vfat" PARTUUID="0c731951-3594-4fd9-a7ef-3a495d952e85"
/dev/sdb1: LABEL="WINSETUP" UUID="3A9D-628A" TYPE="vfat" PARTUUID="cad4ebea-01"
/dev/sdb4: UUID="2016-04-20-22-29-52-00" LABEL="Ubuntu 16.04 LTS amd64" TYPE="iso9660" PTUUID="0e0e8e70" PTTYPE="dos" PARTUUID="cad4ebea-04"
/dev/loop0: TYPE="squashfs"
/dev/sda4: UUID="f19bce1c-df01-4276-c5ec-ef00fce12d81" TYPE="swap" PARTUUID="3c7eba5c-de12-4b22-9556-2a9b75313c7e"
/dev/sr0: UUID="2010-03-02-19-11-00-00" LABEL="SecureDrive" TYPE="iso9660"
 
 
 
ubuntu@ubuntu:~$ cat /mnt/boot/grub/grub.cfg
 
#########################################################
#                                                       #
# Dell Grub2 configuration file for ISO Images          #
# By: Mario Limonciello <Mario_Limonciello@Dell.com>    #
#                                                       #
#########################################################
 
# First check for additional options on ISO image
if [ -s /factory/common.cfg ]; then
    source /factory/common.cfg
fi
 
#Post RTS deliverables
if [ -s /factory/post-rts-gfx.cfg ]; then
    source /factory/post-rts-gfx.cfg
fi
if [ -s /factory/post-rts-wlan.cfg ]; then
    source /factory/post-rts-wlan.cfg
fi
 
# If missing, load a nice basic default set
if [ -z "${options}" ]; then
    set options="boot=casper automatic-ubiquity noprompt quiet splash --"
fi
 
# Setup theme
set timeout=5
set gfxmode=auto
insmod gfxterm
terminal_output gfxterm
loadfont /boot/grub/dejavu-sans-12.pf2
loadfont /boot/grub/dejavu-sans-bold-14.pf2
insmod gfxmenu
insmod png
set theme=/boot/grub/dell/theme.txt
 
# Search for the RP (which contains grubenv in /factory)
search --file --set=new_root /factory/grubenv
if [ -s ($new_root)/factory/grubenv ]; then
    set have_grubenv=true
    load_env -f ($new_root)/factory/grubenv
    if [ -n "${install_finished}" ]; then
        set timeout=-1
        menuentry "Install Complete, remove media and reboot." {
        chainloader +1
        }
    fi
    if [ "x${install_in_progress}" = "x1" ]; then
        set root=$new_root
        configfile ($new_root)/factory/grub.cfg
    fi
fi
 
#Default behavior
menuentry "Dell Recovery" {
    set gfxpayload=keep
    linux   /casper/vmlinuz.efi $options
    initrd  /casper/initrd.lz
}
 
menuentry "Dell Recovery (safe graphics mode)" {
    set gfxpayload=keep
    linux   /casper/vmlinuz.efi $options ubiquity/force_failsafe_graphics=true
    initrd  /casper/initrd.lz
}
ubuntu@ubuntu:~$

sudo fdisk -l /dev/sda

ubuntu@ubuntu:~$ sudo fdisk -l /dev/sda
Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 16B26021-031F-488E-873E-4FB37B511E0C
 
Device         Start       End   Sectors   Size Type
/dev/sda1       2048   1026047   1024000   500M EFI System
/dev/sda2    1026048   7317503   6291456     3G Microsoft basic data
/dev/sda3    7317504 960358399 953040896 454.5G Microsoft basic data
/dev/sda4  960358400 976771071  16412672   7.8G Microsoft basic data

ls
df .

ubuntu@ubuntu:~$ sudo parted -l
Model: ATA WDC WD5000LPCX-7 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 
 
Number  Start   End     Size    File system     Name                  Flags
 1      1049kB  525MB   524MB   fat32           EFI system partition  boot, esp
 2      525MB   3747MB  3221MB  fat32           Basic data partition  msftdata
 3      3747MB  492GB   488GB   fat32                                 msftdata
 4      492GB   500GB   8403MB  linux-swap(v1)                        msftdata
 
 
Model: JetFlash Transcend 16GB (scsi)
Disk /dev/sdb: 16.1GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 
 
Number  Start   End     Size    Type     File system  Flags
 1      8258kB  16.1GB  16.0GB  primary  fat32        boot, lba
 
 
Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0
has been opened read-only.
Error: /dev/sr0: unrecognised disk label
Model: Generic AutoRun Disk (scsi)                                        
Disk /dev/sr0: 11.5MB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:

ubuntu@ubuntu:~$ ls
Desktop  Documents  Downloads  Music  Pictures  Public  Templates  Videos
 
ubuntu@ubuntu:~$ df
Filesystem     1K-blocks    Used Available Use% Mounted on
udev             1963580       0   1963580   0% /dev
tmpfs             395648    6420    389228   2% /run
/dev/sdb4        1451056 1451056         0 100% /cdrom
/dev/loop0       1399936 1399936         0 100% /rofs
/cow             1978228   45932   1932296   3% /
tmpfs            1978228     340   1977888   1% /dev/shm
tmpfs               5120       8      5112   1% /run/lock
tmpfs            1978228       0   1978228   0% /sys/fs/cgroup
tmpfs            1978228     132   1978096   1% /tmp
tmpfs             395648      64    395584   1% /run/user/999
/dev/sdb1       15651960 1451416  14200544  10% /media/ubuntu/WINSETUP

ls
df .