通过 snap 安装后执行命令时heroku，会引发错误dropping privs did not work：
cesar@pc:~$ heroku --version
dropping privs did not work
但如果我执行sudo heroku命令运行：
cesar@pc:~$ sudo heroku --version
▸ heroku-cli: update available from 6.16.4 to 6.99.0-ec9edad
heroku-cli/6.16.4 (linux-x86) node-v9.9.0
附加信息：
cesar@pc:~$ snap version
snap 2.36.1
snapd 2.36.1
series 16
ubuntu 16.04
kernel 4.4.0-139-generic`
cesar@pc:~$ snap list
Name Version Rev Tracking Publisher Notes
core 16-2.36.1 5900 stable canonical✓ core
heroku v6.16.4+git2.3916a9e-dirty 1613 stable heroku✓ classic
Linux version 4.4.0-139-generic (buildd@lgw01-amd64-031) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.10) ) #165-Ubuntu SMP Wed Oct 24 10:55:26 UTC 2018