Add a linode entry about a specific error to troubleshooting.md

[pavelexpertov]

Description

Purpose of the PR is to provide a description of how to resolve an 'unsupported stackscript' which I faced whilst trying to deploy algo onto Linode.

Motivation and Context

I have scoured the repository and internet for this issue and it seems I've spotted a unique issue. Thus, I felt it would be helpful for others if I provided a solution to this problem.

How Has This Been Tested?

N/A since it's updating troubleshooting.md. (But I would appreciate if somebody advises on how to format hyperlinks coz I don't know whether it works properly or not).

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
  N/A since it's updating troubleshooting.md

Checklist:

• I have read the CONTRIBUTING document.
• [] My code follows the code style of this project.
• [] My change requires a change to the documentation.
• I have updated the documentation accordingly.
• [] I have added tests to cover my changes.
• [] All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.