I followed this for SDRAngel in Ubuntu 18.04 and 20.04. I skipped hardware I do not own. So I only did the Lime and the RTL. LimeSoapy seems to address the HF tuning automatically (in GQRX.) I also got the NCO and native driver to work for HF in SDRAngel. I tuned 40 and 80 meters off a 67ish foot wire (not tuned).
This is just the SDRAngel Author’s general install instructions including Lime.