How to update Dell repositories after upgrading XPS 13 to Ubuntu 18.04

Solution 1:

I've spoken to Dell about this and am posting this answer here in case it helps anyone else.

Updated 11 Oct 2018

Dell have said that they do now support Ubuntu 18.04 on the XPS 13 9360 (previously they had said that they didn't). The disabled repositories are not necessary and are not supported in Ubuntu 18.04 ('bionic').

In answer to my question, no, you shouldn't replace 'xenial' with 'bionic' and re-enable the repositories.

The "dino2-mlk" is apparently the codename for the 9360 model of the XPS 13. As mentioned in the comments there isn't a bionic-dell-dino2-mlk repository.

The repositories contain drivers and other updates.