我想安装fastecdsa = 1.6.4。我的python版本是2.7。我需要使用以下命令安装依赖项：
sudo apt-get install python-dev libgmp3-dev但是，出现以下错误
libgmp3-dev : Depends: libgmp-dev (= 2:6.1.2+dfsg-2) but it is not going to be installed
python-dev : Depends: libpython-dev (= 2.7.15~rc1-1) but it is not going to be installed
Depends: python2.7-dev (>= 2.7.15~rc1-1~) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.```