** Description changed: After the kernel update from version 5.4.0-42 to version 5.4.0-45 a few days ago, the boot process is ending in a BusyBox shell. Apparently it cannot properly identify my M.2 NMVe SSD device where my root partition - is. Indeed, it is not listed in /dev. For now, I'm solving this problem - by booting the previous kernel, 5.4.0-42. This works fine. + is. Indeed, it is not listed in /dev (precisely: nvme0 is listed in + /dev, but nvme0n1 and its partitions are not). For now, I'm solving this + problem by booting the previous kernel, 5.4.0-42. This works fine. Also, an earlier attempt ended in a different shell that presented the error message "Gave up on waiting for root file system device". The UUID it indicated as missing is the correct UUID of my root partition, which also appears on /etc/fstab. I tried to re-build initrd.img-5.4.0-45-generic, but to no avail. Let me also mention that in another computer with a non-M.2 SSD, kernel 5.4.0-45 boots properly. This bug seems to be the one mentioned in the following "Unix & Linux" forum question: https://unix.stackexchange.com/questions/607694/ubuntu-20-04-01-not-booting-after-kernel-update Many thanks in advance! ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-42-generic 5.4.0-42.46 ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44 Uname: Linux 5.4.0-42-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ami 3801 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: KDE Date: Sat Sep 5 17:42:26 2020 HibernationDevice: RESUME=UUID=dd70dd06-717a-4acf-a85e-a9ad37cb92ea InstallationDate: Installed on 2017-10-04 (1066 days ago) InstallationMedia: Kubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) IwConfig: enp0s31f6 no wireless extensions. lo no wireless extensions. Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 1532:022a Razer USA, Ltd Razer Cynosa Chroma Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Lsusb-t: /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 480M |__ Port 8: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 8: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 8: Dev 2, If 2, Class=Human Interface Device, Driver=usbhid, 12M MachineType: System manufacturer System Product Name ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-42-generic root=UUID=85262f0d-cb92-475a-8174-2d6316e199a9 ro quiet splash RelatedPackageVersions: linux-restricted-modules-5.4.0-42-generic N/A linux-backports-modules-5.4.0-42-generic N/A linux-firmware 1.187.3 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-05-03 (125 days ago) dmi.bios.date: 06/20/2018 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3807 dmi.board.asset.tag: Default string dmi.board.name: H110M-A/M.2 dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3807:bd06/20/2018:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH110M-A/M.2:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: System manufacturer
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