Answer / hari

hi....
restart->goto shalsh mode(safe mode)->press e->select 2nd kernel line->press e, give 1(for single user mode)nd ENTER
press b(for boot)->sh-3.1# ll appear
then,sh-3.1#passwd root->now give the (new) passwd

Answer / sachinmali17

you need to check /etc/securetty file and u have check the permission this file

Answer / kvenkat

Login into single user mode and try below things:
1. passswd [ Change Password for root ]
2. rm -rf /etc/nologin
3. remove any "nologin" shell for root user in /etc/passwd file
4. chage -l root then chage -E root
5. passwd -u root
6. chattr -i /etc/passwd /etc/shadow
7. chmod 600 /etc/securetty
8. vim /etc/rc.local --> then remove any line like say "
/etc/nplogin "
9. chsh root [ /bin/bash ]

Answer / sampath

It will be easy to recover the root password using single
user mode, but single user mode is secured by grub password.
so that it will restrict the users by logging to the single
user mode.

we can unmake the entry in the grub.conf file by entering
the rescue mode.

Answer / rallapalli

Enter into Single user mode and check the /etc/shadow file
is there are not if it is not there do this
#cp /etc/shadow~ /etc/shadow
now give the password
#passwd



Thanks

Answer / amit tanwar

i think check the permission on passwd command.

Answer / l praveen kumar

Following is the procedure to reset root password if you are
using GRUB as a boot loader:

1. Select the kernel
2. Press the e key to edit the entry
3. Select second line (the line starting with the word
kernel)
4. Press the e key to edit kernel entry so that you can
append single user mode
5. Append the letter S (or word Single) to the end of the
(kernel) line
6. Press ENTER key
7. Now press the b key to boot the Linux kernel into
single user mode
8. At prompt type passwd command to reset password:

You need to mount at least / and other partitions:

# mount -t proc proc /proc
# mount -o remount,rw /

Change the root password, enter:

# passwd

Finally reboot system:

# sync
# reboot

Answer / anonymous

If you are in the list of sudoers than you can also change
the root password using

sudo passwd

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