Unable to update/install any extensions in Joomla

Got into your Cpanel and look for: MultiPHP INI Editor

Select tab: Basic Mode
Configure PHP INI basic settings

Select a location of the domain name from the drop down menu:

Enter the following numbers in the right side column:
DO NOT COPY AND PASTE THESE IN THE .htaccess FILE BECAUSE IT WILL NOT WORK!
Make sure there is a .htaccess file.

max_execution_time => 60
max_input_time => 128
max_input_vars => 1000
memory_limit => 128M
post_max_size => 20M
session.gc_maxlifetime => 1440
upload_max_filesize => 20M

Make sure you hit "Apply" to save these new settings.