I am using Ubuntu 11.04 on a Dell 1510 laptop. Something happened and I was not able to install software using sudo or access my other partitions (that required a root password). Hence, I went into the recovery mode and edited the /etc/sudoers file adding the following :
Thereafter, sudo started working but I am still unable to access my partitions that require me to enter the root password. Also, I am unable to install any software through Ubuntu S/W Centre as it also requires the root password.
There is an Oracle account also that got created after I installed Oracle 10g, but I always use my own account that was created during installation to log in