Missing 1920x1080 resolution in linux

You may have to update your grub file in order to enable the custom resolution in the below file:
$sudo nano /etc/default/grub
Find and remove # from GRUB_GFXMODE line and replace with your required resolution, so it will look like this
GRUB_GFXMODE=1920x1080
Save and exit (Press Cltr+x ,y and enter).
Run below command and reboot.
$sudo update-grub
$sudo reboot

Unzip or extract .zip file in linux

In order to unzip a .zip file in linux (Ubuntu) type this in terminal:
$unzip file_name.zip -d destination_folder
For example, to extract a file named HelloWorld.zip to my current directory:
$unzip HelloWorld.zip -d .
Here . represents current directory, you can give a path to the directory to extract into.
If you see "command not found", you need to install zip command by typing:
$sudo apt-get install unzip

Similar to this, you can zip a file by below command:
$zip filename.zip filename
To install command zip type:
$sudo apt-get install zip

Linux:Unable to install or upgrade firefox in Linux

Installing or upgrading Firefox can be done by using different commands in Linux operating system..
(1) Using yum command you can upgrade your firefox or install.Open terminal and enter su then enter password. Now you are in admin mode so that you can install or upgrade firefox.
For installing anything in linux the user should be in admin mode.
syntax:
$su

$yum update firefox

(2)There is another way of installing firefox in linux that is by using wget command.To use wget command you should have link from where you can download firefox for linux.
Syntax:
$wget link