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8821cu-20210916
Linux Driver for USB WiFi Adapters that are based on the RTL8811CU, RTL8821CU, RTL8821CUH and RTL8731AU Chipsets - v5.12.0.4
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InfluxDB
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The adapter you got should work fine, with the proper driver. I went to their driver download page, and got this archive for Linux Kernels: 4.19 - 5.11. Inside the archive, found the README.md file pointing to a github repository that contains newer versions of the driver https://github.com/morrownr/8821cu-20210916. You should give it a try.
As I've said this one (rtl8821cu) is a pita to setup. Try this instead https://github.com/brektrou/rtl8821CU.