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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2116044 Title: Daily Lubuntu Questing fails to boot in Lenovo C30 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2116044/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
