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My installation of Lubuntu 18.04.2 LTS has upgraded to kernel 5.0.0.23 from 4.18.0-25 via Software Update and my Airspy HF+ SDR is no longer recognised. I can get GQRX to recognise it by reverting to the older kernel version. I have seen a comment in ask ubuntu that suggests 18.04 should not be using version 5.0.0.23. Is this upgrade correct?

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    5.0.0.23 is the HWE kernel for Ubuntu and flavors LTS 18.04.3. The bump of the dot-number to .3 should come soon. You might want to edit your question to have an actual question in it, right now it reads like a comment. – Organic Marble Aug 3 at 13:39
  • If you want non-HWE kernels you should install either Lubuntu 18.04 or Lubuntu 18.04.1. All ISO's from .2 onwards have HWE enabled by default (I, along with others are in the process of QA-testing the .3 ISO currently, it should be released Thursday). You can apt full-upgrade either 18.04/18.04.1 or 18.04.2 after installation and they end up the same, except for kernel being used; 18.04.2 using HWE kernel (which will upgrade itself until it finally uses the 20.04 kernel). Your behavior is consistent with a 18.04.2 installation. – guiverc Aug 4 at 1:33
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If you want non-HWE kernels you should install either Lubuntu 18.04 or Lubuntu 18.04.1. All ISO's from .2 onwards have HWE enabled by default (I, along with others are in the process of QA-testing the .3 ISO currently, it should be released Thursday 8 August 2019 though will use the HWE kernel too).

You can sudo apt full-upgrade either 18.04/18.04.1 or 18.04.2 after installation and they end up the same, except for kernel being used; 18.04.2 using HWE kernel (which will upgrade itself until it finally uses the 20.04 kernel).

Your behavior is consistent with a 18.04.2 installation

See https://wiki.ubuntu.com/Kernel/LTSEnablementStack for details about the HWE or hardware enablement stack kernels. HWE kernels whilst in theory are slightly less stable (less production testing), they have advantages for newer hardware...

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