dmesg will not run Ubuntu 22.04 due to permissions issues. To change that edit /etc/sysctl.d/10-kernel-hardening.conf
Uncomment the last line:
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kernel.dmesg_restrict = 0 |
and restart the procps service
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sudo service procps restart |
A USB to TTL CH340/CH341 debug board may automatically become disconnected in Ubuntu 22.04:
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[ 7471.658077] usb 3–1: USB disconnect, device number 2 [ 7475.571781] usb 3–1: new full–speed USB device number 3 using xhci_hcd [ 7475.749014] usb 3–1: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.54 [ 7475.749031] usb 3–1: New USB device strings: Mfr=0, Product=2, SerialNumber=0 [ 7475.749037] usb 3–1: Product: USB2.0–Serial [ 7475.758159] ch341 3–1:1.0: ch341–uart converter detected [ 7475.772124] usb 3–1: ch341–uart converter now attached to ttyUSB0 [ 7476.513703] input: BRLTTY 6.4 Linux Screen Driver Keyboard as /devices/virtual/input/input21 [ 7476.674061] usb 3–1: usbfs: interface 0 claimed by ch341 while ‘brltty’ sets config #1 [ 7476.682158] ch341–uart ttyUSB0: ch341–uart converter now disconnected from ttyUSB0 [ 7476.682222] ch341 3–1:1.0: device disconnected |
Remove the brltty package to solve the issue:
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sudo apt remove brltty |
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