在Ubuntu中安装dumpcap（Wireshark的命令行版本）可以通过以下步骤完成：
更新软件包列表： 打开终端并运行以下命令来确保你的软件包列表是最新的：
sudo apt update
安装dumpcap：
使用以下命令来安装dumpcap：
sudo apt install dumpcap
验证安装：
安装完成后，你可以通过运行以下命令来验证dumpcap是否正确安装：
dumpcap --version
如果安装成功，你应该会看到dumpcap的版本信息。
如果你在安装过程中遇到权限问题，可能需要使用sudo来提升权限。例如，在安装过程中可能会出现类似以下的提示：
sudo: unable to resolve host your-hostname: Name or service not known
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
wireshark-common wireshark-data
Suggested packages:
wireshark-gtk wireshark-cli wireshark-lua
The following NEW packages will be installed:
dumpcap wireshark-common wireshark-data
0 upgraded, 3 newly installed, 0 to remove and 3 not upgraded.
Need to get 0 B/1,074 kB of archives.
After this operation, 3,072 kB of additional disk space will be used.
Selecting previously unselected package wireshark-data.
(Reading database ... 60%)
...
Unpacking wireshark-data (3:2.6.5-1) ...
Selecting previously unselected package wireshark-common.
Unpacking wireshark-common (3:2.6.5-1) ...
Selecting previously unselected package dumpcap.
Unpacking dumpcap (3:2.6.5-1) ...
Setting up wireshark-data (3:2.6.5-1) ...
Setting up wireshark-common (3:2.6.5-1) ...
Processing triggers for man-db (2.9.1-1) ...
Setting up dumpcap (3:2.6.5-1) ...
Processing triggers for man-db (2.9.1-1) ...
dumpcap通常需要root权限来捕获网络流量。如果你在运行dumpcap时遇到权限问题，可以使用sudo来提升权限，例如：
sudo dumpcap -i eth0 -w output.pcap
如果你需要捕获特定接口的流量，确保你有足够的权限访问该接口。
通过以上步骤，你应该能够在Ubuntu系统中成功安装并使用dumpcap。