ubuntu 18.04 Install libpcap

1. please prefer : https://www.pianshen.com/article/2303219981/

concrete steps are:
1.1 to get libpcap packet from https://www.tcpdump.org/#latest-releases

1.2 to install according to https://www.tcpdump.org/#latest-releases

problem: if encounter like this and solve use this command

2. if encounter this problem,can solve user method like pictures:

原文：https://www.cnblogs.com/dLarger/p/15207477.html