Серверный терминал Ubuntu?

Я установил сервер ubuntu на свой компьютер с Windows 7 и не могу перезагрузить Windows 7. Я хочу знать, случайно ли я отформатировал свой жесткий диск или случайно заменил свою ОС. Как загрузить ubuntu с терминала сервера ubuntu?

alejandro@JandroMunoz: ~$ df -h
Filesystem            Size Used Avail Use% Mounted on
/dev/mapper/JandroMunoz-root
                      680G  1.4G  644G  1% /
undev                 3.9G  4.0K  3.9G  1% /dev
tmpfs                 1.6G  400K  1.6G  1% /run
none                  5.0M     0  5.0M  0% /run/lock
none                  3.9G  4.0K  3.9G  1% /run/shm
/dev/sda1             228M   29M  188M 14% /boot
/home/alejandro/.Private
                      680G  1.4G  644G  1% /home/alejandro
alejandro@JandroMunoz: ~$ mount
/dev/mapper/JandroMunoz-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
/dev/sda1 on /boot type ext2 (rw)
/home/alejandro/.Private on /home/alejandro type ecryptfs (ecryptfs_check_dev_ruid,ecryptfs_cipher=aes,ecryptfs_key_bytes=16,ecryptfs_unlink_sigs,ecryptfs_sig=71839318eaf89afd,ecryptfs_fnek_sig=2aaae6
alejandro@JandroMunoz: ~$ sudo fdisk -l

[sudo] password for alejandro:

Disk /dev/sda: 750.2 GB,  750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 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
Disk identifier: 0x00025c60

  Device Boot     Start         End     Blocks    Id  System
/dev/sda1  *       2048      499711     248832    83  Linux
/dev/sda2        501758  1465147391  732322817     5  Extended
Partition 2 does not start on physical sector boundary.
/dev/sda5        501760  1465147391  732322816    8e  Linux LVM

Disk /dev/mapper/JanbroMunoz-root: 741.4 GB, 741360009216 bytes
255 heads, 63 sectors/track, 90131 cylinders, total 1447968768 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
Disk identifier: 0x00000000

Disk /dev/mapper/JandroMunoz-swap_1 doesn't contain a valid partition table
alejandro@JandroMunoz: ~$ sudo parted -l

Model: ATA TOSHIBA MK7559GS (scs1)
Disk /dev/sda: 750GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos

Number   Start   End   Size   Type     File System  Flags
 1       1049kB  256MB 255MB  primary  ext2         boot
 2       257MB   750GB 750GB  extended
 5       257MB   750GB 750GB  logical               lvm

Error: /dev/mapper/JandroMunoz-swap_1: unrecognized disk label

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/JandroMunoz-root: 741GB
Sector size (logical/physical): 512B/4096B
Partition Table: loop

Number   Start   End   Size   Type     File System  Flags
 1       0.00B   741GB 741GB  ext4