我尝试安装 UNetbootin。在项目上地点写为：
要从 Ubuntu PPA 安装 UNetbootin，请运行以下命令：
sudo add-apt-repository ppa:gezakovacs/ppa sudo apt-get update sudo apt-get install unetbootin
我完成了前两个步骤，在第三步我收到了这条消息：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
unetbootin : Depends: libqt4-network (>= 4:4.5.3) but it is not installable
Depends: libqtcore4 (>= 4:4.7.0~beta1) but it is not installable
Depends: libqtgui4 (>= 4:4.5.3) but it is not installable
Depends: p7zip-full but it is not installable
Depends: syslinux but it is not installable
Depends: syslinux-common but it is not installable
Recommends: extlinux but it is not installable
Recommends: unetbootin-translations but it is not going to be installed
Recommends: gksu but it is not installable or
kdesudo but it is not installable
E: Unable to correct problems, you have held broken packages.
我尝试安装 Lutris 来通过 Epic 游戏运行 GTA 5我收到了类似的消息：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
lutris : Depends: python3-evdev but it is not installable
Depends: python3-setproctitle but it is not installable
Depends: cabextract but it is not installable
Depends: p7zip but it is not installable
Depends: fluid-soundfont-gs but it is not installable
Depends: mesa-utils but it is not installable
Recommends: libwine-development but it is not installable Recommends: winetricks but it is not installable
Recommends: libc6-i386 but it is not installable
Recommends: lib32gcc1 but it is not installable
E: Unable to correct problems, you have held broken packages.
与其他情况一样，我需要添加 ppa：
sudo add-apt-repository ppa:lutris-team/lutris
sudo apt-get update
sudo apt-get install lutris
为了解决我尝试的问题在 Ubuntu 上删除 PPA，在 Ubuntu 中将源列表恢复为默认值，如何修复损坏的 Ubuntu 而无需重新安装它（葡萄牙语）什么也没起作用。