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As @JOcean correctly stated, your laptop does support Ubuntu.
Even if Dell doesn't officially support Linux on a particular computer, you can likely install it and drivers will be found. I've installed Ubuntu, Xubuntu and Mint on a few old Dells that officially don't support Linux.

JOcean
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Posted July 2nd, 2023 18:00
As per this page at Ubuntu, they list the 5515 as certified for Ubuntu. This Dell page for the 5511 lists drivers that are also compatible with the 5515.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop