[问题]安装防火墙时，出现以下提示，如何处理？

[sedy]

安装防火墙时，出现以下提示，如何处理？
ky@ky-book:~$ sudo gunzip -c /usr/share/doc/shorewall/default-config/interfaces.gz > /etc/shorewall/interfaces
bash: /etc/shorewall/interfaces: Permission denied
ky@ky-book:~$ sudo gunzip -c /usr/share/doc/shorewall/default-config/rules.gz > /etc/shorewall/rules
bash: /etc/shorewall/rules: Permission denied
ky@ky-book:~$ sudo gunzip -c /usr/share/doc/shorewall/default-config/hosts.gz > /etc/shorewall/hosts
bash: /etc/shorewall/hosts: Permission denied
ky@ky-book:~$ sudo gunzip -c /usr/share/doc/shorewall/default-config/masq.gz > /etc/shorewall/masq
bash: /etc/shorewall/masq: Permission denied