我已经完成了对 Ubuntu 20.04 的更新，并且也在尝试更新这些软件包，但是我遇到了一个错误，我的一个软件包被保留了。这是运行“sudo apt upgrade”后的输出：
Reading package lists...
Done Building dependency tree
Reading state information...
Done Calculating upgrade...
Done The following packages have been kept back:
gdb gir1.2-peas-1.0 libpeas-1.0-0 libsmbclient libwbclient0 samba-libs
0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded.
我尝试运行多个命令来清除损坏的包/依赖项，包括：
sudo apt clean
sudo apt autoclean
sudo apt autoremove
似乎没有任何效果（甚至 dist-upgrade 也没有任何作用），当我尝试手动更新软件包时，我收到以下消息：
sudo apt-get install gdb
The following packages have unmet dependencies:
gdb : Depends: libpython3.8 (>= 3.8.0~a1) but it is not going to …