我最近买了一个 eGPU 和一张显卡。我使用笔记本电脑的主显示器以及连接到 eGPU 背面的辅助显示器，但无法检测到第二台显示器。
我目前的设置是 Razer Core X(v2) 中的 R9 290X。第二台显示器通过 HDMI 连接，我尝试了显示端口，但也没用。Core 打开并被认可由 Ubuntu 提供。显示器确实可以工作，因为我已经通过雷电底座尝试过，没有问题。我已将 USB 键盘插入 eGPU，它也能正常工作。
我也尝试安装 Radeon 驱动程序，但在运行时遇到问题amdgpu 安装
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 resolve the situation:
The following packages have unmet dependencies:
rocm-llvm : Depends: libstdc++-5-dev but it is not installable or
libstdc++-7-dev but it is not installable
Depends: libgcc-5-dev but it is not installable or
libgcc-7-dev but it is not installable
Recommends: gcc-multilib but it is not going to be installed
Recommends: g++-multilib but it is not going to be installed
E: Unable to correct problems, you have held broken packages.