dd is the software you are looking for; it comes just without a GUI! therefore (if handled right) it a is pretty powerful, simple, and quick tool.
read the page for dd at the Raspberry Pi Documentation and/or Wikipedia for further details, and you will get a command-line like this:
sudo dd bs=4M if=/home/"username"/Desktop/retropie-v3.0beta2-rpi2.img of=/dev/mmcblk0
BUT be careful:
sudo is a prefix to execute commands as administrator and can potentially harm your system! - but in this case you need it to access your hardware.
- be sure you selected the right drive for
of= because it will be completely overwritten!
some additional hints:
(not necessary! just optional, maybe too much for noobs, but sometimes nice to have...)
- since there is no "progress-bar" you can modify your command like this:
dd if=image.img of=/dev/sdX & ddpid=$! ; while [ $(ps -ao pid | grep $ddpid) ]; do kill -SIGUSR1 $ddpid; sleep 1; done
sleep 1 at the end you can set the refresh rate in seconds: for example use
sleep 3 or
sleep 10 for an update every 3 or 10 seconds...
- you can also use the downloaded .gz/.xz-file direct with a command modified like this:
gzip -d -c image.img.gz | dd of=/dev/sdX
- and for sure you can also combine them (now with a .xz-compressed file):
xz -d -c image.img.xz | dd of=/dev/sdX & ddpid=$! ; while [ $(ps -ao pid | grep $ddpid) ]; do kill -SIGUSR1 $ddpid; sleep 1; done
for any other questions please first have a look at the real good Raspberry Pi Documentation! - maybe thats why someone has voted down your question...