Getting "There was an error running option 1 expand filesystem"

This is based on https://www.chrisnewland.com/resize-raspberry-pi-sd-card-partition-to-fill-32gb-card-from-a-running-raspberry-pi-245 but here for our own reference in case the other page ever goes away!

Backup your SD card to an image file first!

Enter this to see the current partition usage:

df

E.g.

Filesystem     1K-blocks    Used Available Use% Mounted on
rootfs           3698504 3351472    146524  96% /
/dev/root        3698504 3351472    146524  96% /
devtmpfs          494800       0    494800   0% /dev
tmpfs              99820     240     99580   1% /run
tmpfs               5120       0      5120   0% /run/lock
tmpfs             199620       0    199620   0% /run/shm
/dev/mmcblk0p1     57288   19400     37888  34% /boot

The rootfs and /dev/root is the same thing, its just a debian thing the have them both appear as seperate

Enter this:

sudo fdisk /dev/mmcblk0

Then press 'p' to see the current partitions on the disk.  E.g.

Disk /dev/mmcblk0: 7860 MB, 7860125696 bytes
4 heads, 16 sectors/track, 239872 cylinders, total 15351808 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xa6202af7
        Device Boot      Start         End      Blocks   Id  System
/dev/mmcblk0p1            8192      122879       57344    c  W95 FAT32 (LBA)
/dev/mmcblk0p2          122880    15351807     7614464   83  Linux

Now delete the 2nd partition (it won't actually delete the data on it)

Press 'd' > Enter

Press '2' > Enter

Now re-create it:

Press 'n' > Enter

Press 'p' > Enter

Press '2' > Enter

Enter the First sector and the same value as the original /dev/mmcblk0p2 partition (122880 from the above example).

For the Last sector just press enter to use the maximum value.

Now press 'p' > Enter to see the new partition setup.

Finally press 'w' > Enter to write it

Now reboot:

sudo shutdown -r now

Once its back do the resize

sudo resize2fs /dev/mmcblk0p2

This may take a little while to complete…

Now enter the command

df

and hey presto, you've expanded to use all the space :-)

Filesystem     1K-blocks    Used Available Use% Mounted on
rootfs           7513804 3352360   3810208  47% /
/dev/root        7513804 3352360   3810208  47% /
devtmpfs          494800       0    494800   0% /dev
tmpfs              99820     240     99580   1% /run
tmpfs               5120       0      5120   0% /run/lock
tmpfs             199620       0    199620   0% /run/shm
/dev/mmcblk0p1     57288   19400     37888  34% /boot