Reset Password

for lost passwords in debian:

1. boot to grub
2. press E during kernelselection
3. add in the row of the kernel: init=/bin/bash
4. boot now Ctrl+X
5. mount -o remount,rw /
mount -avt nonfs,noproc,nosmbfs
6. edit passwd vi /etc/shadow
   delete password for root::15120:0:99999:7:::
   and/or user::15120:0:99999:7:::
   or cp /etc/shadow /tmp/shadow && sed -e 's/root:\(.*\):\(.*\):\(.*\):\(.*\):\(.*\):\(.*\)::/root::\2:\3:\4:\5::/g' /tmp/shadow /etc/shadow
7. change password now: passwd
   and/or passwd user
8. reboot

mount -o remount,rw /
mount -avt nonfs,noproc,nosmbfs
cp /etc/shadow /tmp/shadow
sed -e 's/root:\(.*\):\(.*\):\(.*\):\(.*\):\(.*\):\(.*\)::/root::\2:\3:\4:\5::/g' /tmp/shadow /etc/shadow
passwd root
abc123
abc123
! use password abc123 for root login now 
reboot