Reading package lists... Done Building dependency tree... Done Reading state information... Done Package libssl-dev:armhf is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'libssl-dev:armhf' has no installation candidate

这个问题可能是因为你的系统架构不是 `armhf` 导致的。你可以尝试执行以下命令来安装适合你系统架构的 libssl-dev 包：

sudo apt-get install libssl-dev

如果你的系统是基于 64 位的架构，则使用以下命令安装：

sudo apt-get install libssl-dev:amd64

安装完成之后，再重新编译 Python 并重新安装 pip：

./configure --with-openssl=/usr/include/openssl
make
sudo make install
sudo apt-get install python3-pip

这样应该就可以解决你的问题了。