for example, the following command: sudo apt-get install pcre-devel
results as follows:
is reading the package list. Finish
analyzing the dependency tree of the package
is reading status information. Complete
E: unable to locate package pcre-devel
all devel packages report this error
none of these methods on the Internet can be solved:
https://blog.csdn.net/mo3408/article/details/79934396
https://blog.csdn.net/zhwisdom0427/article/details/72898772
https://www.zhihu.com/question/41311332
https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/