ubuntu tutorials installation download issues etc

How to Enable root login Ubuntu

sudo passwd root

enter new password & confirm

1st time: News password

and confirm the same

New password

Now open the nano /etc/lightdm/lightdm.conf file and add the following lines(Create if not exist).

Paste the below code

[SeatDefaults]
greeter-session=unity-greeter
user-session=ubuntu
greeter-show-manual-login=true

Then, save the file and restart.

To disable root login ubuntu try below command

sudo passwd -dl root

How to Dual Boot Windows & Linux (Ubuntu)?

If you are already installed windows 10. then again insert a CD ROM of USB Drive to desktop or laptop.

Proceed to install and Select the Preferred Driver or same drive. after installation, you will see every time dual boot Options.

It’s maybe better to install Ubuntu on other drive partitions of the hard disk.

Ubuntu and Debian vs Redhat, Fedora, Centos

All of above are Linux distributions.
Debian is Parent of Ubuntu (main difference Debian releases new versions longtime bais stable versions. while releases new versions within months).
Redhat, Fedora, centos are owned by RHEL Company. (Redhat is premium and centos are free, fedora maybe for beta testing between centos and ReDthat.

Ubuntu download

Latest Version 17.10

https://www.ubuntu.com/download

Ubuntu issues

boot/grub/i386-pc/normal.mod not found

grub secure/

ls (hd0,msdos1)/

set root=(hd0,msdos1)

ls /

set prefix=(hd0,msdos1)/boot/grub

insmod /boot/grub/linux.mod

normal

above solutions work most of the cases, but if you moved accidentally boot files to another folder in the command line with sudo permissions. then you may look for other sources. or reinstall or mount new disk etc.