我正在尝试安装virtualenv
sugumar@sugumar-Vostro-3478:~$ pip3 install virtualenv
Collecting virtualenv
Using cached https://files.pythonhosted.org/packages/c4/9a/a3f62ac5122a65dec34ad4b5ed8d802633dae4bc06a0fc62e55fe3e96fe1/virtualenv-16.6.1-py2.py3-none-any.whl
Installing collected packages: virtualenv
Successfully installed virtualenv-16.6.1
现在出现以下错误：
sugumar@sugumar-Vostro-3478:~$ virtualenv project1
Command 'virtualenv' not found, but can be installed with:
sudo apt install virtualenv