Main user account not in sudoers list Debian 6.0 Squezze

[CesarOscar]

When i installed the new version of debian on my laptop to try it out, i noticed that i can't sudo as my main account is not in the sudoers list and i cannot put me in because i'm not sudo.

cesar@debian:~$ groups
cesar cdrom floppy audio dip video plugdev netdev powerdev scanner bluetooth

I have to enter as a root account but don't know how, plus i forgot my root password.

note. i dualboot with ubuntu 10.04 and grub is managed by it.

[sisco311]

You can edit Debian's sudoers file from Ubuntu. Assuming that /dev/sda1 is Debain's root (`/') partition, run:

sudo mkdir /mnt/debian
sudo mount /dev/sda1 /mnt/debian

Edit the file:

sudo visudo -f /mnt/debian/etc/sudoers

append it with:

cesar ALL=(ALL) ALL

Save the changes, close the file and unmount the partition:

sudo umount /mnt/debian
sudo rmdir /mnt/debian

Reboot in Debian and reset the root password:

sudo passwd root