Drush 8 not working correctly on (LAMP) Ubuntu 16.04 I am running LAMP on Ubuntu 16.04.  I have a drupal 7 installation and I have installed drush 8.1.3 via Composer version 1.5.2. I believe there is bug in php7.2 causing the error as discussed on Github, however even after I applied the recommended fix which is to update the pear/console_table to the latest version instructed here, the problem still remains. I also followed the instructions on Super User to be absolutely sure that I have the most up to date version of pear installed as well (did not install PHPunit).  And, FYI in accordance with the drush installation documentation found here, I also made the proper changes to my .bashrc file as well (below).

Whenever I run drush status I receive the following error:

[UPDATE: This part of problem SOLVED by @GiorgosK answer below.  Other problems persist due to Drush not find mysql socket]

count(): Parameter must be an array or an object that implements     [warning]
Countable Table.php:789
count(): Parameter must be an array or an object that implements     [warning]
Countable Table.php:789
count(): Parameter must be an array or an object that implements     [warning]
Countable Table.php:789
count(): Parameter must be an array or an object that implements     [warning]
Countable Table.php:789
count(): Parameter must be an array or an object that implements     [warning]
Countable Table.php:789
count(): Parameter must be an array or an object that implements     [warning]
Countable Table.php:789
count(): Parameter must be an array or an object that implements     [warning]
Countable Table.php:789
count(): Parameter must be an array or an object that implements     [warning]
Countable Table.php:789
PHP executable         :  /usr/bin/php                                 
PHP configuration      :  /etc/php/7.2/cli/php.ini                     
PHP OS                 :  Linux                                        
Drush script           :  /home/webdevusr/vendor/drush/drush/drush.php 
Drush version          :  8.1.13                                       
Drush temp directory   :  /tmp                                         
Drush configuration    :                                               
Drush alias files      :   


If I execute drush sql-connect

Unable to load class Drush\Sql\Sql                                  [error]
Drush\Sql\SqlException: Unable to find a matching SQL Class. Drush   [error]
cannot find your database connection details. in
/home/webdevusr/vendor/drush/drush/commands/sql/sql.drush.inc:541
Stack trace:
#0
/home/webdevusr/vendor/drush/drush/commands/sql/sql.drush.inc(221):
drush_sql_get_class()
#1 /home/webdevusr/vendor/drush/drush/includes/command.inc(422):
drush_sql_connect()
#2 /home/webdevusr/vendor/drush/drush/includes/command.inc(231):
_drush_invoke_hooks(Array, Array)
#3 /home/webdevusr/vendor/drush/drush/includes/command.inc(199):
drush_command()
#4
/home/webdevusr/vendor/drush/drush/lib/Drush/Boot/BaseBoot.php(67):
drush_dispatch(Array)
#5 /home/webdevusr/vendor/drush/drush/includes/preflight.inc(66):
Drush\Boot\BaseBoot-&gt;bootstrap_and_dispatch()
#6 /home/webdevusr/vendor/drush/drush/drush.php(12): drush_main()
#7 {main}


The contents of my ~/.bashrc file, are as follows:

export PATH="$HOME/.composer/vendor/bin:$PATH"

export PATH=/bin:/usr/local/bin:/usr/local/mysql/bin:$PATH

# Include Drush bash customizations.
if [ -f "/home/webdevusr/.drush/drush.bashrc" ] ; then
source /home/webdevusr/.drush/drush.bashrc
fi

# Include Drush completion.

if [ -f "/home/webdevusr/.drush/drush.complete.sh" ] ; then
source /home/webdevusr/.drush/drush.complete.sh
fi

# Include Drush prompt customizations.

if [ -f "/home/webdevusr/.drush/drush.prompt.sh" ] ; then
source /home/webdevusr/.drush/drush.prompt.sh
fi


The result of drush cc all executed from within my drupal installation folder is:

No Drupal site found, only 'drush' cache was cleared. 


Anyone know how to get drush to working for my local (LAMP) Drupal 7 installations?

thx
Recently run into a similar problem on my local environment after an ubuntu update and php 7.2 became my default version.

make 7.1 or lower your default php version

I believe you should make php 7.1 the default or perhaps even a lower php version for Drupal 7 installation as not all modules are ready for php 7.2 (even some of Drupal 8 modules are not ready for php 7.2)

type this in your shell

$ sudo update-alternatives --config php


and this is what you will get 

There are 4 choices for the alternative php (providing /usr/bin/php).

  Selection    Path             Priority   Status
------------------------------------------------------------
* 0            /usr/bin/php7.2   72        auto mode
  1            /usr/bin/php5.6   56        manual mode
  2            /usr/bin/php7.0   70        manual mode
  3            /usr/bin/php7.1   71        manual mode
  4            /usr/bin/php7.2   72        manual mode
Press &lt;enter&gt; to keep the current choice[*], or type selection number:


Choose the appropriate version 

might need to update drush to a later version.

8.1.16 is out at this moment and might already have solved the problem you describe. Update using composer 

alternatively you can try to setup drush without composer

# get drush latest 8 version from 
# https://github.com/drush-ops/drush/releases
wget https://github.com/drush-ops/drush/releases/download/8.1.16/drush.phar

# make it executable
chmod +x drush.phar;

# move it to home directory or any other directory
mv drush.phar ~/drush;

# go to that directory
cd ~

# find out the path to the directory
pwd
# the output would look similar to this
# /home/your_user

# edit the following file 
nano .bashrc
# or 
# nano .bash_profile

# add this the end of the file
alias drush='/home/your_user/drush';

# use the alias you just setup
source ~/.bashrc;


might want to specify site directory when you invoke drush

as you drush might have a messed up setup/aliases

drush status -r /path/to/site/rootdir


doublecheck your settings.php

Does it include the correct database connections? Does the site actually run with those connection settings ? 

Look in your logs for any problems

in my system I can see apache errors like this 

tail -50 /var/log/apache2/error.log 


You might discover that some apache packages are missing or disabled just an example lets say mod_rewrite is not enabled

sudo a2enmod rewrite
sudo service apache2 restart


or you might find that some package is missing like mysql-client 

sudo apt-get install mysql-client