安装时无法安装
dpkg：依赖性问题阻碍了 libqt3-mt 的配置：
libqt3-mt depends on libpng12-0 (>= 1.2.13-4); however:
Package libpng12-0:amd64 is not installed.
dpkg: error processing package libqt3-mt (--install):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of pdfedit:
pdfedit depends on libqt3-mt (>= 3:3.3.8-b); however:
Package libqt3-mt is not configured yet.
dpkg: error processing package pdfedit (--install):
dependency problems - leaving unconfigured
Processing triggers for libc-bin (2.29-0ubuntu2) ...
Processing triggers for man-db (2.8.5-2) ...
Processing triggers for gnome-menus (3.32.0-1ubuntu1) ...
Processing triggers for desktop-file-utils (0.23-4ubuntu1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Errors were encountered while processing:
libpng12-0_1.2.54-1ubuntu1_amd64.deb
libqt3-mt
pdfedit
错误消息