Install Issues

[epoch18]

Hi. First time testing your app.

Ubuntu 20.04
PHP7.4

I am having the following errors that I can't get resolved while trying to install:

user@mk3:/var/www/BuySYS# php composer.phar update

Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install symfony/symfony v3.4.1 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.2 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.3 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.4 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.5 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.6 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.7 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.8 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.9 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.10 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.11 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.12 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.13 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.14 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.15 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.16 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.17 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.18 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.19 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.20 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.21 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.22 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.23 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.24 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.25 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.26 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.27 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.28 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.29 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.30 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.31 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.32 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.33 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.34 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.35 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.36 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.37 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.38 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.39 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.40 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.41 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.42 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.43 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.44 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.45 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.46 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.47 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.48 (conflict analysis result)
    - Conclusion: don't install symfony/symfony v3.4.49 (conflict analysis result)
    - Only one of these can be installed: symfony/web-server-bundle[v4.4.0, ..., v4.4.37], symfony/symfony[v3.4.0, ..., v3.4.49]. symfony/symfony replaces symfony/web-server-bundle and thus cannot coexist with it.
    - Root composer.json requires symfony/symfony 3.4.* -> satisfiable by symfony/symfony[v3.4.0, ..., v3.4.49].
    - Root composer.json requires symfony/web-server-bundle ^4.4 -> satisfiable by symfony/web-server-bundle[v4.4.0, ..., v4.4.37].

user@mk3:/var/www/BuySYS# php composer.phar install

Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Warning: The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. It is recommended that you run `composer update` or `composer update <package name>`.
Your lock file does not contain a compatible set of packages. Please run composer update.

  Problem 1
    - ocramius/package-versions is locked to version 1.5.1 and an update of this package was not requested.
    - ocramius/package-versions 1.5.1 requires composer-plugin-api ^1.0.0 -> found composer-plugin-api[2.2.0] but it does not match the constraint.
  Problem 2
    - ocramius/package-versions 1.5.1 requires composer-plugin-api ^1.0.0 -> found composer-plugin-api[2.2.0] but it does not match the constraint.
    - doctrine/orm v2.7.3 requires ocramius/package-versions ^1.2 -> satisfiable by ocramius/package-versions[1.5.1].
    - doctrine/orm is locked to version v2.7.3 and an update of this package was not requested.

I'm not familiar with Composer so I don't know how to resolve these. Do I need an older version of Composer maybe?

Thanks,

[entropylaw]

Yes, you need to downgrade composer.
I'm using v1.10.20