Can`t install gatsby plugins

[vadiminsk]

Description

Ubuntu 20.04, NPM 7.6.0 NodeJS 10.19.0
Have an error when trying to install filesystem plugin

Steps to reproduce

npm install gatsby-source-filesystem

Expected result

Should install plugin

Actual result

`npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/gatsby
npm ERR! gatsby@"^2.26.1" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer gatsby@"^3.0.0-next.0" from [email protected]
npm ERR! node_modules/gatsby-source-filesystem
npm ERR! gatsby-source-filesystem@"*" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See /home/user/.npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR! /home/user/.npm/_logs/2021-03-05T18_22_25_296Z-debug.log`

Environment

It`s just my local env

[LekoArts]

Thank you for opening this!

You're on a v2 version of gatsby but want to install a version of gatsby-source-filesystem that requires v3 of gatsby. npm 7 doesn't handle this gracefully -- that's why we encourage to use --legacy-peer-deps flag: https://www.gatsbyjs.com/docs/reference/release-notes/migrating-from-v2-to-v3/#update-gatsby-version

Also, it's best if you also upgrade the gatsby version to v3. Then all installs of the plugins will work :)

We're marking this issue as answered and closing it for now but please feel free to comment here if you would like to continue this discussion. We also recommend heading over to our communities if you have questions that are not bug reports or feature requests. We hope we managed to help and thank you for using Gatsby!