我正在尝试安装一个名为 OpentTeacher 的软件，但我尝试过的所有方法都不起作用。当我尝试使用 apt-get 时，它显示unable to locate package。当我下载 .deb 文件并尝试使用 dpkg 安装时，我得到：
dpkg: dependency problems prevent configuration of openteacher:
openteacher depends on python:any (<< 2.8).
openteacher depends on python:any (>= 2.7.5-5~).
openteacher depends on python-pyqt5; however:
Package python-pyqt5 is not installed.
openteacher depends on python-pyqt5.qtopengl; however:
Package python-pyqt5.qtopengl is not installed.
openteacher depends on python-pyqt5.qtmultimedia; however:
Package python-pyqt5.qtmultimedia is not installed.
openteacher depends on python-pyqt5.qtquick; however:
Package python-pyqt5.qtquick is not installed.
openteacher depends on python-pyqt5.qtwebkit; however:
Package python-pyqt5.qtwebkit is not installed.
openteacher depends on python-chardet; however:
Package python-chardet is not installed.
openteacher depends on python-enchant; however:
Package python-enchant is not installed.
openteacher depends on python-urwid; however:
Package python-urwid is not installed.
每当我尝试使用 apt-get 时，它都会显示此消息：
The following packages have unmet dependencies:
openteacher : Depends: python:any (< 2.8) but it is not installable
Depends: python:any (>= 2.7.5-5~) but it is not installable
Depends: python-pyqt5 but it is not installable
Depends: python-pyqt5.qtopengl but it is not installable
Depends: python-pyqt5.qtmultimedia but it is not installable
Depends: python-pyqt5.qtquick but it is not installable
Depends: python-pyqt5.qtwebkit but it is not installable
Depends: python-chardet but it is not installable
Depends: python-enchant but it is not installable
Depends: python-urwid but it is not installable
如果有人知道如何解决这个问题，那将会非常有帮助。