chroot permission denied! But I'm root!

Chroot in ubuntu or recovering Ubuntu,Debian Linux

boot from livecd of ubuntu, if you installed with system 32bit use 32bit Live CD, If 64bit use 64 bit live cd.

Mount the Linux Partitions using

# sudo blkid

Output:

sysadmin@localhost:~$ sudo blkid
[sudo] password for sysadmin: 
/dev/sda1: UUID="846589d1-af7a-498f-91de-9da0b18eb54b" TYPE="ext4" 
/dev/sda5: UUID="36e2f219-da45-40c5-b340-9dbe3cd89bc2" TYPE="swap" 
/dev/sda6: UUID="f1d4104e-22fd-4b06-89cb-8e9129134992" TYPE="ext4"

Here my / Partition is /dev/sda6

Mount the / Partition to mount point using

# sudo mount /dev/sda6 /mnt

Then Mount the linux access points, Linux devices, Proc, sys

Linux Device

# sudo mount --bind /dev/ /mnt/dev

proc system information

# sudo mount --bind /proc/ /mnt/proc

Kernel information to user space

# sudo mount --bind /sys /mnt/sys

If we need to enable the networking we need to do the following steps (Optional).

# cp /etc/resolv.conf /mnt/etc/resolv.conf

Change the Linux root to be the device we mounted earlier in step 2

# sudo chroot /mnt

Now try to change the root password it will work.

You can't execute /bin/bash in your chroot and that is most likely because your filesystem is mount with the noexec option and maybe also with nosuid. You can check this running with the mount command as that will show the mount options and you may need to remount the filesystem with other options.

(this does not answer the chroot, but can allow you to change a forgotten unix passwd)

I understood disk is mounted on /media/usb

try

cd /media/usb/etc
vi shadow

pick line with root, wipe second field (or you can pick the crypted string of a know password from your actual /etc/shadow).

• in case shadow don't exists, do the same in passwd