Update ubuntu.md. Fix sudo apt-get install ./docker-desktop-amd64.deb

[Knase]

I changed
sudo apt-get install ./docker-desktop-amd64.deb
to
sudo dpkg -i ./docker-desktop-amd64.deb

Because I got this error with command apt-get install N: Download is performed unsandboxed as root as file './docker-desktop-amd64.deb' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

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[docker-robot]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions.
As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment.
If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[aevesdocker]

Closing PR as this is expected and the error you received is documented on that page and you can ignore the error