composer – Drupal 8, cannot install Symfony Vardumper component (Ubuntu 16) Drupal 8.9.2

I am having issues installing symfony/var-dumper package via composer
the command I ran is

composer require symfony/var-dumper

The result I get is

Your requirements could not be resolved to an installable set of packages.

Problem 1
   - Conclusion: remove drupal/core-recommended 8.9.1
   - Conclusion: don't install drupal/core-recommended 8.9.1
   - Conclusion: don't install symfony/var-dumper v5.1.2
   - Conclusion: don't install symfony/var-dumper v5.1.1
   - Conclusion: don't install symfony/var-dumper v5.1.0
   - Conclusion: don't install symfony/var-dumper v5.1.0-RC2
   - Conclusion: don't install symfony/var-dumper v5.1.0-RC1
   - Conclusion: don't install symfony/var-dumper v5.1.0-BETA1
   - Installation request for drupal/core-recommended (locked at 8.9.1, required as ^8.8) -> satisfiable by drupal/core-recommended(8.9.1).
   - Conclusion: don't install symfony/var-dumper 5.2.x-dev
   - drupal/core-recommended 8.9.1 requires symfony/console v3.4.41 -> satisfiable by symfony/console(v3.4.41).
   - symfony/console v3.4.41 conflicts with symfony/var-dumper(5.1.x-dev).
   - symfony/var-dumper 5.1.x-dev conflicts with symfony/console(v3.4.41).
   - symfony/var-dumper 5.1.x-dev conflicts with symfony/console(v3.4.41).
   - Installation request for symfony/var-dumper ^5.1 -> satisfiable by symfony/var-dumper(5.1.x-dev, 5.2.x-dev, v5.1.0, v5.1.0-BETA1, v5.1.0-RC1, v5.1.0-RC2, v5.1.1, v5.1.2).
   Installation failed, reverting ./composer.json to its original content.

My composer.json file is

  "name": "drupal/legacy-project",
  "description": "Project template for Drupal 8 projects with composer following drupal/drupal layout",
  "type": "project",
  "license": "GPL-2.0-or-later",
  "homepage": "",
  "support": {
    "docs": "",
    "chat": ""
  "repositories": {
    "0": {
        "type": "composer",
        "url": ""
    "drupal": {
        "type": "composer",
        "url": ""
  "require": {
    "composer/installers": "^1.2",
    "drupal/core-composer-scaffold": "^8.8",
    "drupal/core-project-message": "^8.8",
    "drupal/core-recommended": "^8.8",
    "drupal/core-vendor-hardening": "^8.8",
    "phpmailer/phpmailer": "^6.1"
  "conflict": {
    "drupal/drupal": "*"
  "minimum-stability": "dev",
   "prefer-stable": true,
   "config": {
    "sort-packages": true
  "extra": {
    "drupal-scaffold": {
        "locations": {
            "web-root": "./"
    "installer-paths": {
        "core": (
        "libraries/{$name}": (
        "modules/contrib/{$name}": (
        "profiles/contrib/{$name}": (
        "themes/contrib/{$name}": (
        "drush/Commands/contrib/{$name}": (
        "modules/custom/{$name}": (
        "themes/custom/{$name}": (
    "drupal-core-project-message": {
        "include-keys": (
        "post-create-project-cmd-message": (
            "<bg=blue;fg=white>                                                         </>",
            "<bg=blue;fg=white>  Congratulations, you’ve installed the Drupal codebase  </>",
            "<bg=blue;fg=white>  from the drupal/legacy-project template!               </>",
            "<bg=blue;fg=white>                                                         </>",
            "<bg=yellow;fg=black>Next steps</>:",
            "  * Install the site:",
            "  * Read the user guide:",
            "  * Get support:",
            "  * Get involved with the Drupal community:",
            "  * Remove the plugin that prints this message:",
            "      composer remove drupal/core-project-message"

I haven’t even customized it yet, this is pretty much out of the box at the moment and I am already having issues.

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Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  apache2-data libbrotli1 libonig2 libqdbm14 libssl1.0.2 php5-cli php5-json php5-readline
Use 'sudo apt autoremove' to remove them.
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The following packages will be REMOVED:
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The following NEW packages will be installed:
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0 upgraded, 4 newly installed, 7 to remove and 12 not upgraded.
Need to get 3,191 kB of archives.
After this operation, 14.1 MB disk space will be freed.
Do you want to continue? [Y/n] y

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enter image description here

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