Format a SD card with YUN

I found this software to format my SD card (attached). The problem is that it always return an exit code of 255 and then the error message:

Ready to install utility software. Please ensure your Arduino Yun is connected to internet.
Ready to proceed (yes/no)? answer yes
Updating software list…
Software list updated. Installing software (this will take a while)…

Exit code255
err. installing e2fsprogs dosfstools fdisk rsync kmod-fs-ext4

How do I get past this point to the actual formatting of the SD card?

sketch_sep21b.ino (8.47 KB)

How do I get past this point to the actual formatting of the SD card?

Did your Yun had access to the Internet while you run that sketch?

Log into your Yun by SSH and run the command

opkg install e2fsprogs dosfstools fdisk rsync kmod-fs-ext4

manually on the command line. It will give you an error message (probably). Post that error message.