I don't think this is a kernel issue. The machine has a cdrom drive which the kernel identifies correctly. You're booting from USB and not the CDROM, so yes /dev/sr0 (the cdrom) has no media.
From kern.log: 2025-07-06T15:29:12.482649+00:00 lubuntu kernel: Linux version 6.15.0-3-generic (buildd@lcy02-amd64-104) (x86_64-linux-gnu-gcc-14 (Ubuntu 14.3.0-1ubuntu1) 14.3.0, GNU ld (GNU Binutils for Ubuntu) 2.44.50.20250602) #3-Ubuntu SMP PREEMPT_DYNAMIC Wed Jun 4 08:34:48 UTC 2025 (Ubuntu 6.15.0-3.3-generic 6.15.0) 2025-07-06T15:29:12.485308+00:00 lubuntu kernel: sr 1:0:0:0: [sr0] scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray 2025-07-06T15:29:12.485309+00:00 lubuntu kernel: cdrom: Uniform CD-ROM driver Revision: 3.20 2025-07-06T15:29:12.485309+00:00 lubuntu kernel: sr 1:0:0:0: Attached scsi CD-ROM sr0 2025-07-06T15:29:12.485310+00:00 lubuntu kernel: sr 1:0:0:0: Attached scsi generic sg1 type 5 The installer finds the image, so I'm not sure what causes the error. Looks more like a build/installer issue than kernel. casper.log: stdin: Not a typewriter GPT PMBR size mismatch (6800715 != 60970488) will be corrected by write. The backup GPT table is not on the end of the device. GPT PMBR size mismatch (6800715 != 60970488) will be corrected by write. The backup GPT table is not on the end of the device. 48+0 records in 48+0 records out GPT PMBR size mismatch (6800715 != 60970488) will be corrected by write. The backup GPT table is not on the end of the device. This problem will be corrected by write. GPT PMBR size mismatch (60970488 != 60970489) will be corrected by write. The backup GPT table is not on the end of the device. 48+0 records in 48+0 records out hostname: Name or service not known make-ssl-cert: Could not get FQDN, using '(none)'. make-ssl-cert: You may want to fix your /etc/hosts and/or DNS setup and run make-ssl-cert: 'make-ssl-cert generate-default-snakeoil --force-overwrite' make-ssl-cert: again. sudo: unable to resolve host (none): Name or service not known dbus-daemon[778]: [session uid=1000 pid=18446744073709551615 pidfd=5] Activating service name='org.gtk.vfs.Daemon' requested by ':1.0' (uid=1000) dbus-daemon[778]: [session uid=1000 pid=18446744073709551615 pidfd=5] Successfully activated service 'org.gtk.vfs.Daemon' dbus-daemon[778]: [session uid=1000 pid=18446744073709551615 pidfd=5] Activating service name='org.gtk.vfs.Metadata' requested by ':1.0' (uid=1000) fuse: device not found, try 'modprobe fuse' first dbus-daemon[778]: [session uid=1000 pid=18446744073709551615 pidfd=5] Successfully activated service 'org.gtk.vfs.Metadata' A connection to the bus can't be made ln: /root/usr/lib/update-notifier/apt-check: No such file or directory Using CD-ROM mount point /cdrom/ Identifying... [348731d6cc476a0bfa61a94de83b4a4a-2] Scanning disc for index files... Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures Found label 'Lubuntu 25.10 _Questing Quokka_ - Daily amd64 (20250705)' This disc is called: 'Lubuntu 25.10 _Questing Quokka_ - Daily amd64 (20250705)' Copying package lists...gpgv: Signature made Sat Jul 5 17:02:40 2025 UTC gpgv: using RSA key 843938DF228D22F7B3742BC0D94AA3F0EFE21092 gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key (2012) <[email protected]>" gpgv: asserted signer '843938DF228D22F7B3742BC0D94AA3F0EFE21092' with algo rsa4096 ^MReading Package Indexes... 0%^MReading Package Indexes... Done Writing new source list Source list entries for this disc are: deb cdrom:[Lubuntu 25.10 _Questing Quokka_ - Daily amd64 (20250705)]/ questing main multiverse restricted universe Repeat this process for the rest of the CDs in your set. chown: warning: '.' should be ':': 'lubuntu.lubuntu' chown: warning: '.' should be ':': 'lubuntu.lubuntu' Casper does find the minimal squashfs: 2025-07-06T15:29:48.423303+00:00 lubuntu casper-md5check[2540]: Checking ./casper/minimal.squashfs.............................................................../casper/minimal.squashfs: OK 2025-07-06T15:29:48.423381+00:00 lubuntu casper-md5check[2540]: Checking ./casper/minimal.squashfs.gpg..../casper/minimal.squashfs.gpg: OK 2025-07-06T15:29:48.423504+00:00 lubuntu casper-md5check[2540]: Checking ./.disk/cd_type..../.disk/cd_type: OK 2025-07-06T15:29:48.423558+00:00 lubuntu casper-md5check[2540]: Checking ./.disk/base_installable..../.disk/base_installable: OK 2025-07-06T15:29:48.423598+00:00 lubuntu casper-md5check[2540]: Checking ./.disk/info..../.disk/info: OK 2025-07-06T15:29:48.423725+00:00 lubuntu casper-md5check[2540]: Checking ./.disk/casper-uuid-generic..../.disk/casper-uuid-generic: OK 2025-07-06T15:29:48.423940+00:00 lubuntu casper-md5check[2540]: Checking ./.disk/release_notes_url...../.disk/release_notes_url: OK 2025-07-06T15:29:48.423987+00:00 lubuntu casper-md5check[2540]: Check finished: no errors found. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2116044 Title: Daily Lubuntu Questing fails to boot in Lenovo C30 Status in linux package in Ubuntu: New Bug description: The failure happens rather early in the boot process. when booting Lubuntu Questing from a USB pendrive. The grub menu is OK, but the process get stuck with a repeated error output to the screen, '/init: line38: can't open /dev/sr0: no media ... Unable to find a medium containing a live image Obviously I cannot report from the failing system, but I can attach what was sometime written to the writable partition. (However, I am not sure if [some of] it was written while booting in another computer, a Dell Precision M4800, where it works. Please notice that the same failure occurs when trying to boot Ubuntu Desktop Questing, so I suspect that this bug affects several if not all Ubuntu flavours, and I guess the linux kernel is to blame. Please notice also that the output below about Ubuntu 22.04 was produced automatically (but that version was possible to install, and has been working for years). I am reporting a bug about Lubuntu (and Ubuntu Desktop) *Questing*. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-6.8.0-60-generic 6.8.0-60.63~22.04.1 ProcVersionSignature: Ubuntu 6.8.0-60.63~22.04.1-generic 6.8.12 Uname: Linux 6.8.0-60-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: olle 2090 F.... pulseaudio /dev/snd/controlC0: olle 2090 F.... pulseaudio CRDA: N/A CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Sun Jul 6 18:06:52 2025 InstallationDate: Installed on 2023-01-07 (910 days ago) InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1) IwConfig: lo no wireless extensions. eno1 no wireless extensions. MachineType: LENOVO 11369C2 ProcFB: 0 nouveaudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-60-generic root=UUID=a127f627-4587-462d-8c4b-7ea75cf75de2 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-6.8.0-60-generic N/A linux-backports-modules-6.8.0-60-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.37 RfKill: SourcePackage: linux-hwe-6.8 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/14/2018 dmi.bios.release: 0.64 dmi.bios.vendor: LENOVO dmi.bios.version: A3KT64AUS dmi.board.name: LENOVO dmi.board.vendor: LENOVO dmi.board.version: SDK0E50510 WIN dmi.chassis.type: 7 dmi.chassis.vendor: LENOVO dmi.chassis.version: NONE dmi.modalias: dmi:bvnLENOVO:bvrA3KT64AUS:bd03/14/2018:br0.64:svnLENOVO:pn11369C2:pvrThinkStationC30:rvnLENOVO:rnLENOVO:rvrSDK0E50510WIN:cvnLENOVO:ct7:cvrNONE:skuLENOVO_BI_A3: dmi.product.family: To be filled by O.E.M. dmi.product.name: 11369C2 dmi.product.sku: LENOVO_BI_A3 dmi.product.version: ThinkStation C30 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2116044/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
