XPS 13 9310 Upgrade to Ubuntu 24.04 : no wifi no sound

Problem solved: for some funky reason I realized the new 6.8 kernel was downloaded in /boot but not used. There was a file `/etc/default/grub.d/oem-flavour.cfg` which contained:

```

# This file is automatically generated by oem-somerville-bulbasaur-meta, and changes will be overriden GRUB_FLAVOUR_ORDER=oem

```

Changing the value to `GRUB_FLAVOUR_ORDER=generic` allowed to switch to the desired kernel 6.8 and solved the drivers issue.

I am very much surprised how none of this is referenced on the forum...

@mazzma​ I'm having the exact problem as you, but how did you update that file? If I click on it and edit the text and try to save it it fails to save it and says too many symbolic links.
Is there a special way to edit the file? thank you

Edit, i found out how to edit the file in terminal, but when  did and rebooted it would only boot if I selected the older 5.14 kernel. any tips to fix this? Thank you

This post helped me to resolve the wifi issue i had after upgrade. Thanks.
After booting the 6.8 kernel via Advanced options for ubuntu and running the command "sudo update-grub2" resolved the issue.

@mazzma​ super useful, thank you very much!  

Using the hold down left shift method, I get  grub> (command line). Is there a way to get to the advanced options menu show above?

solved using https://askubuntu.com/questions/1014634/how-to-access-advanced-options-in-grub and https://askubuntu.com/questions/87409/i-cant-get-grub-menu-to-show-up-during-boot. 

if this common, suggest a complete step by step from Dell.