Can't uninstall angular-cli

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- [ ] feature request

Versions.

@angular/cli: 1.0.0
node: 7.8.0
os: linux x64

Repro steps.

Install angular-cli globally with old version of npm. Upgrade npm to new version. You can no longer uninstall the previously installed angular-cli as the global install path changed from /usr/local/lib/node_modules to /usr/lib/node_modules. This old install will act as poison and prevent you from upgrading to 1.0.0.

The log given by the failure.

Desired functionality.

Update upgrade guide to account for older versions of npm.

I was able to remove poison with:

$ sudo rm -rf /usr/local/lib/node_modules/@angular
$ sudo rm /usr/local/bin/ng

And then reinstalling with npm.

Mention any other details that might be useful.

[RPGillespie6]

@beeman No, the issue is indeed with Angular CLI, specifically the Upgrade Guide

From the Upgrade Guide:

Angular CLI can now be found on NPM under @angular/cli instead of angular-cli, and has a minimum requirement of Node 6.9.0 or higher, together with NPM 3 or higher.

Ok, so step one is to update Node and NPM if they are out of date. I did so. Oops, now there’s a poisoned angular-cli in my system that I can never get rid of thanks to your guide!

Guide needs to be fixed so that:

1. Uninstalling angular-cli step happens before upgrading node or npm
2. Upgrade node or npm if necessary
3. Install latest angular-cli

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