每当我尝试使用更新系统时
sudo apt update && apt upgrade
我发现这个错误
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
我正在使用带有 Plasma 的 Ubuntu 20.04.1 LTS x86_64