關閉iptables服務及命令行鏈接wifi及locale設置

Ubuntu系統啓動時都會自動啓動iptables服務。若是想關閉該服務的自動啓動，能夠執行：

sudo ufw disable

命令行方式鏈接某個SSID：

sudo nmcli d wifi connect $SSID_NAME password $SSID_PASS

wget下載須要用戶名及密碼的資源：

$ wget --user=??? --password=??? http://xxx/xxx/xxx
$ wget --user=??? --password=??? ftp://xxx/xxx/xxx

  關於locale設置問題，執行apt時一般會提示以下錯誤：

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LC_TIME = "zh_CN.UTF-8",
    LC_MONETARY = "zh_CN.UTF-8",
    LC_ADDRESS = "zh_CN.UTF-8",
    LC_TELEPHONE = "zh_CN.UTF-8",
    LC_NAME = "zh_CN.UTF-8",
    LC_MEASUREMENT = "zh_CN.UTF-8",
    LC_IDENTIFICATION = "zh_CN.UTF-8",
    LC_NUMERIC = "zh_CN.UTF-8",
    LC_PAPER = "zh_CN.UTF-8",
    LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

 按以下步驟解決：

$ sudo apt-get install locales

 編輯文件/etc/locale.gen，找到# en_US.UTF-8 UTF-8，去掉前面的井號；

$ sudo locale-gen en_US.UTF-8
$ sudo update-locale en_US.UTF-8

編輯~/.bashrc，在最後面增長一行並經過source命令使其生效：

export LC_ALL=C
$ source .bashrc

或者修改/etc/default/locale：

$ cat /etc/default/locale 
LC_ALL="en_US.UTF-8"

 到此應該能解決錯誤信息提示問題，可是系統可能沒法顯示中文，因此若是但願正確顯示中文，須要安裝中文包：

$ sudo apt-get install language-pack-zh-hans