fix: use nvidia drivers version 418.126.02 for 18.04

[jackfrancis]

Reason for Change:

This PR re-enables N series for Ubuntu 18.04-LTS using nvidia drivers version 418.126.02.

Issue Fixed:

Fixes #3269
Fixes #3274

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[jackfrancis]

Thank you @xuto!

[codecov]

Codecov Report

Merging #3366 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3366      +/-   ##
==========================================
- Coverage   72.16%   72.14%   -0.02%     
==========================================
  Files         147      147              
  Lines       25419    25404      -15     
==========================================
- Hits        18343    18328      -15     
  Misses       5939     5939              
  Partials     1137     1137              

Impacted Files	Coverage Δ
pkg/api/vlabs/validate.go	80.37% <ø> (-0.16%)	⬇️
pkg/engine/templates_generated.go	44.47% <ø> (ø)
pkg/api/defaults.go	92.58% <100.00%> (-0.07%)	⬇️

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[mboersma]

/lgtm

[jackfrancis]

Validated successful 18.04 VHD build

[Michael-Sinz]

/lgtm

[acs-bot]

@Michael-Sinz: changing LGTM is restricted to collaborators

In response to this:

/lgtm

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[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, mboersma, Michael-Sinz

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