*** This bug is a duplicate of bug 1848790 *** https://bugs.launchpad.net/bugs/1848790
About the problem of "there is no /dev/mmcblk0* device", I checked your dmesg, there are two places are weird the 1st one is about the raspberrypi-firmware, on my board, the dmesg will show: [ 0.100540] raspberrypi-firmware soc:firmware: Attached to firmware from 2019-08-15 12:03, variant start [ 0.110122] raspberrypi-firmware soc:firmware: Firmware hash is 9f8431fb7839c7f00f52b81f5822ddab2b31d0db And there are not errors about firmware, but your dmesg is different. the 2nd one is about mmc-bcm2835 driver, your kernel always report: mmc-bcm2835 fe300000.mmcnr: could not get clk, deferring probe That is different from my board, on my board, it only reports that message once, Then the driver could get the clk successfully. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1848703 Title: Raspberry Pi 4 - USB Bus not detecting any devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1848703/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs