ubuntu@ubuntu:~$ sudo apt-get install testdisk
Reading package lists... Done
Building dependency tree
Reading state information... Done
testdisk is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 93 not upgraded.
ubuntu@ubuntu:~$
_____________________________
ubuntu@ubuntu:~$ sudo umount /dev/sda1
ubuntu@ubuntu:~$ sudo umount /dev/sda2
ubuntu@ubuntu:~$ sudo umount /dev/s
umount: /dev/s: not found
ubuntu@ubuntu:~$ sudo umount /dev/s
umount: /dev/s: not found
ubuntu@ubuntu:~$
_________________________
ubuntu@ubuntu:~$ sudo umount /dev/sda2
umount: /dev/sda2: not mounted
ubuntu@ubuntu:~$
___________________
ubuntu@ubuntu:~$ cat /etc/mtab
aufs / aufs rw 0 0
none /proc proc rw,noexec,nosuid,nodev 0 0
none /sys sysfs rw,noexec,nosuid,nodev 0 0
none /dev devtmpfs rw,mode=0755 0 0
none /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0
/dev/sdb1 /cdrom vfat ro,noatime,fmask=0022,dmask=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0
/dev/loop0 /rofs squashfs ro,noatime 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 /dev/shm tmpfs rw,nosuid,nodev 0 0
tmpfs /tmp tmpfs rw,nosuid,nodev 0 0
none /var/run tmpfs rw,nosuid,mode=0755 0 0
none /var/lock tmpfs rw,noexec,nosuid,nodev 0 0
none /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0
gvfs-fuse-daemon /home/ubuntu/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=ubuntu 0 0
//192.168.0.100/share /mnt/backup cifs rw,mand 0 0
ubuntu@ubuntu:~$
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