The ro flag is correct, the / filesystem is remounted rw after a filesystem check, I don't know where precisely, I'm gonna reassign this to systemd
** Package changed: grub2 (Ubuntu) => systemd (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1968135 Title: BTRFS root subvolume @ mounted always as readonly (... ro rootflags=subvol=@ ...) on Jammy beta Status in systemd package in Ubuntu: New Bug description: = Description = On Ubuntu Jammy Jellyfish (beta 220330) where root (/) is installed on single BTRFS formated partition (no LVM, no separate /boot), then root subvolume (subvol=@) is always mounted as read only. There is a kernel flag (ro) appended to GRUB configuration file /boot/grub/grub.cfg created by script /usr/sbin/update-grub during every kernel update. Only home subvolume (@home) remains mounted as rw according to fstab which is correct. Read-only mounted root (/) leads to many issues. Image: Jammy Beta (220330) = Steps to Reproduce = 1. Install Jammy Beta (220330) on EFI PC x86_64 GPT partitioning and select FS root (/) to one single BTRFS partition (where subvolumes @ and @home are created). There are only 3 partitions EFI system partition (/dev/sda1), one swap (sda2), and one BTRFS formated (/dev/sda3) for FS root (/). 2. Launch the kernel via the default grub entry (or look for kernel boot parameters pressing <e>) - root subvolume (@) is mounted as readonly. = Expected Results = root / should be mounted as rw (mount -v | grep @), there should be no (ro) flag in /proc/cmdline for FS root. It is possible to temporarily avoid this behaviour in /etc/defaul/grub: GRUB_CMDLINE_LINUX_DEFAULT="rw quiet splash" Then there still remains "ro" kernel parameter which is followed by "rw quiet splash" at the end. = Actual Results = in grub.cfg: linux /@/boot/vmlinuz-5.15.0-23-generic root=UUID=xxxx-xxxx-... rootflags=subvol=@ ro quiet splash $vt_handoff in /proc/cmdline: BOOT_IMAGE=/@/boot/vmlinuz-5.15.0-25-generic root=UUID=981dd6de-02fc-41a9-9e2a-09dbbc776b2b ro rootflags=subvol=@ quiet splash vt.handoff=7 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1968135/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
