If you had planned to develop this domain WITH LICENSED PERMISSION from the Linux Foundation, it's still not worth much. As a linux user, my inclination would be to look for the desired distro first and then for the version so it does not make sense to me in your generic context.
Contact NameCheap support and ask them nicely if they will Grace Delete and give you a refund
https://www.linuxfoundation.org/trademark-usage/
Rules and Policies Applicable to Marks Owned by The Linux Foundation
In addition to the generally applicable rules discussed above, there are a few specific rules that we ask everyone to follow when using trademarks owned by The Linux Foundation.
- Do not attempt to claim or assert any ownership rights in any mark of The Linux Foundation and do not attempt to register any The Linux Foundation trademark as a trademark, trade name, domain name, or “doing business as” name, alone or (unless specifically licensed) in combination with your own trademarks.