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ubuntu允许Carla出现问题合集*1.sudo apt-get update**2.permission denied* 1.sudo apt-get update 问题： Fetched 32.8 MB in 1min 16s (430 kB/s) W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty...

出现的现象：python --version Python 3.7.1 想要实现的目标：版本为3.5 方法： echo alias python=python3.5 >> ~/.bashrc source ~/.bashrc 成功啦 python --version Python 3.5.2