![Ubuntu 主题不适用于所有应用程序?](https://linux22.com/image/903828/Ubuntu%20%E4%B8%BB%E9%A2%98%E4%B8%8D%E9%80%82%E7%94%A8%E4%BA%8E%E6%89%80%E6%9C%89%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%EF%BC%9F.png)
主题(不仅仅是 Arc)似乎不适用于 Virtualbox。
Virtualbox 似乎是唯一存在此问题的应用程序。有办法解决这个问题吗?
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
$ apt-cache policy virtualbox-5.2
virtualbox-5.2:
Installed: 5.2.18-124319~Ubuntu~xenial
Candidate: 5.2.18-124319~Ubuntu~xenial
Version table:
*** 5.2.18-124319~Ubuntu~xenial 500
500 https://download.virtualbox.org/virtualbox/debian xenial/contrib amd64 Packages
100 /var/lib/dpkg/status