FWIW: the "Read-only file system" error occured again. See below.
Nothing special in dmesg nor /var/log/syslog sander@superstream:~$ pwd /home/sander sander@superstream:~$ touch blabla touch: cannot touch ‘blabla’: Read-only file system sander@superstream:~$ mount /dev/mmcblk0p5 on / type ext4 (rw,errors=remount-ro) proc on /proc type proc (rw,noexec,nosuid,nodev) sysfs on /sys type sysfs (rw,noexec,nosuid,nodev) none on /sys/fs/cgroup type tmpfs (rw) none on /sys/fs/fuse/connections type fusectl (rw) none on /sys/kernel/debug type debugfs (rw) none on /sys/kernel/security type securityfs (rw) none on /sys/firmware/efi/efivars type efivarfs (rw) udev on /dev type devtmpfs (rw,mode=0755) devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755) none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880) none on /run/shm type tmpfs (rw,nosuid,nodev) none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755) none on /sys/fs/pstore type pstore (rw) /dev/mmcblk0p1 on /boot/efi type vfat (rw) systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd) gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=sander) /dev/mmcblk0p4 on /media/sander/Images type fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096) /dev/mmcblk0p3 on /media/sander/Windows type fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096) mount: warning: /etc/mtab is not writable (e.g. read-only filesystem). It's possible that information reported by mount(8) is not up to date. For actual information about system mount points check the /proc/mounts file. sander@superstream:~$ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1417263 Title: sdhci: Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1417263/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs