I have repeatedly tried to make my Ethernet connection appear in the network manager. I am currently using Kubuntu 21.04.

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Ethernet controller: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller (rev 05)

In my research I recall reading something about the device being blacklisted. I am interested in enabling the interface. If the usage is not acceptable I would then disable the interface.

Thanks

erm, you do realise you are using an unreleased version of Kubuntu, which is not meant for productive use, I would expect a lot more things not working yet...
FWIW: strictly speaking, there is no Kubuntu 21.04 yet, but a Kubuntu Hirsute Hippo with no release candidate.

Closing this thread as it is out of scope for this forum.