The /dev/sda4 partition has my OSX boot, and I don't wanna lose that. Is it okay if it isn't mounted? And are all these other partitions normal? I only partitioned once when installing Ubuntu.

harvey@harvey-MacBookPro:~$ df -H
    Filesystem      Size  Used Avail Use% Mounted on
    /dev/sda4       255G  6.2G  236G   3% /
    none            4.1k     0  4.1k   0% /sys/fs/cgroup
    udev            4.2G  4.1k  4.2G   1% /dev
    tmpfs           828M  1.4M  827M   1% /run
    none            5.3M     0  5.3M   0% /run/lock
    none            4.2G  193k  4.2G   1% /run/shm
    none            105M   50k  105M   1% /run/user
    /dev/sda1       207M   22M  186M  11% /boot/efi
  • ? /dev/sda4 is mounted. It's really the only linux partition mounted... – Rmano Mar 2 '15 at 9:14

/dev/sda4 partition has my OSX boot

No, it does not. It is the root system for your Ubuntu. /dev/sda1 holds you EFI boot; that is the one that lets you boot into operating systems (plural!).

And are all these other partitions normal?

Yes. Do take notice of the "NONE" in the filesystem column. This indicates a partition that is not physical but stored in memory. See also: what does device node 'none' means in file system?

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/dev/sda4 is mounted at the root of the filesystem, which is what / represents. It's sort of like the root of the Ubuntu filesystem tree, everything else comes under root, unless you specifically mount parts of your system on other partitions.

When you type a file path, that first / represents root.

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