1.Preconditions for solution
LZ found the package libtinfo. So. 5 in the directory/usr/lib64. Although there is no libtinfo. So. 6, there is libtinfo. So. 5, which can be downward compatible. Building a link can solve this problem. 
2.Solutions
1. Replace the nonexistent libtinfo. So. 6 library with libtinfo. So. 5 and execute the following command
[root@localhost /]# cd /usr/lib64/
[root@localhost lib64]# ln -s libtinfo.so.5 libtinfo.so.6
2. Execute the telnet command again.
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