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.
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
7 Technologist
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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.
filbert
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July 2nd, 2023 22:00
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.