In Ubuntu linuxdeployqt packaging Qt program, because I'm version of Ubuntu is higher, so according to the online tutorial download linuxdeployqt source files, release mode generated executable file, found in the bin directory linuxdeployqt file, copied to/usr/local/bin/directory, and then encountered an error while performing linuxdeployqt: linuxdeployqt: symbol lookup error: linuxdeployqt: undefined symbol: _ZdlPvm, version Qt_5, small white didn't want to know is what reason, hope the great god grant instruction,