https://devzone.nordicsemi.com/f/nordic-q-a/86285/segger-j-link-firmware-repeatedly-disconnecting-on-linuxHi, folks, I&#39;m finding that when I connect either an nRF52-DK (PCA10040 2.1.0 2020.31) or an nRF52840-DK (PCA10056 2.0.1 2020.33) to Linux (Ubuntu 20.04.4 LTS) the board connects and disconnects repeatedly to the point where I can&#39;t even program aen-USTelligent Community 13Mon, 28 Mar 2022 00:07:52 GMThttps://devzone.nordicsemi.com/thread/360127?ContentTypeID=1Mon, 28 Mar 2022 00:07:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:26fbc280-d69c-4d83-b517-bf0ac0cd2a7aAndrew Lentvorski<p>This apparently has something to do with USB 3.0 hubs.&nbsp; I can provoke similar fails on Windows by plugging the hub into front ports rather than back ports.&nbsp; It is odd that two different hubs exhibit similar failures, but it&#39;s possible they&#39;re both broken.</p> <p></p> <p>I&#39;ve ordered some new hubs, I&#39;ll report back if that clears the issue.</p><div style="clear:both;"></div>