错误提示:
Reading package lists… Done
Building dependency tree… Done
Package aptitude 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 has no installation candidate
问题描述
在 Debian系统安装 ufw
时出现上问题,执行的命令如下:
apt-get install ufw
解决方案:
apt-get update
apt-get upgrade
apt-get install <packagename>
apt-get install ufw
ufw 命令安装
-bash/zsh: ufw command not found
apt-get install ufw
apt-get install ufw
pacman -S ufw
apt-get install ufw
dnf install ufw
apt-get install ufw
防火墙命令
ufw status
ufw enable
ufw disable
ufw allow 22/tcp
ufw allow 8888
ufw delete allow 8888
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