If you are a newbie in Linux world, You know that It's annoying that partitions aren't mounted by default and you have to enter password to mount It. Of course one can say it's security standpoint, etc. But that doesn't make it less annoying, Does it?!

Install Gnome-Disks

First, Install Gnome-disk-utility and if you're using Gnome Desktop Environment, No need to do this step because it's already installed.

# Fedora
dnf install gnome-disk-utility

# Debian, Ubuntu
apt install gnome-disk-utility

Then Go to launcher and type disks and you will find the app:

How to

After opening the app, Select the disk that contains the partition, choose the partition, and click on the setting button:

Choose "Edit Mount Options":

Disable "User Session Defaults" and make sure "Mount at system startup" is checked.

Select "OK" and Enter your password. do this for every partition you want to mount automatically.

There you go, Enjoy.