error: RPC failed; curl 56 GnuTL

sudo apt-get install build-essential fakeroot dpkg-dev

sudo vim /etc/apt/sources.list

mkdir git-source
cd git-source/
sudo apt source git

sudo apt build-dep git

sudo apt-get install libcurl4-openssl-dev

cd git-*
vim ./debian/control # libcurl4-gnutls-dev 修改为 libcurl4-openssl-dev
vim ./debian/rules # 注释TEST=test行
sudo dpkg-buildpackage -rfakeroot -b

cd .. 
sudo dpkg -i git_*_amd64.deb