ok guys finaly i can update my kernel :)
i try beafore using synaptic i get some error and my system can't startup , but this case work for me on mint 17.1
i hope u enjoy
open terminal and input this command
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1. #cd /tmp
2. #git clone https://github.com/ribalinux/uki
3. #cd uki
4. #chmod +x uki
5. #sudo ./uki
6. #Enter
7. #sudo reboot
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dont worry it working 100% nice to me but if u wondering to un install it
uninstall
# sudo apt-get purge linux-image-3.19.0.*