尝试打开VirtualBox时，显示以下消息：

VirtualBox: supR3HardenedMainGetTrustedMain: dlopen("/usr/lib/virtualbox/VirtualBox.so",) failed: /usr/lib/libharfbuzz.so.0: undefined symbol: FT_Get_Var_Blend_Coordinates

在仔细检查上述错误之后，我得出了一个结论，VirtualBox在更新HarfBuzz到1.4.1-1版本之后不起作用。
因此，我认为将HarfBuzz降级到旧版本可能解决这个问题。
我已经搜索了我的本地缓存，看看是否有任何旧版HarfBuzz。

$ls /var/cache/pacman/pkg/

示例输出：

harfbuzz-1.4.1-1-x86_64.pkg.tar.xz virtualbox-5.1.12-1-x86_64.pkg.tar.xz
 harfbuzz-icu-1.4.1-1-x86_64.pkg.tar.xz

不幸的是，我在本地缓存文件夹中没有任何旧版本的Harfbuzz来回滚。

但是，我知道另一个解决方法来解决这个问题。
在Arch Linux及其衍生产品中，我们可以使用"降级"实用程序轻松降级到其旧版本的包。
只需按照以下链接中所述安装降级实用程序。

• 如何在Arch Linux中降级包

一旦安装了降级实用程序，我们就可以轻松降级HarfBuzz包，如下所示。

$sudo downgrade harfbuzz

我们应该在本地缓存和Arch Linux存储库中查看列表旧包。
只需选择较旧版本并按Enter键。
在我的情况下，我选择了显示HarfBuzz-1.3.4-1版本的第三个选项。

Available packages:
1) harfbuzz-1.4.1-1-x86_64.pkg.tar.xz (remote)
 2) harfbuzz-1.4.1-1-x86_64.pkg.tar.xz (local)
 3) harfbuzz-1.3.4-1-x86_64.pkg.tar.xz (remote)
 4) harfbuzz-1.3.3-2-x86_64.pkg.tar.xz (remote)
 5) harfbuzz-1.3.3-1-x86_64.pkg.tar.xz (remote)
 6) harfbuzz-1.3.2-1-x86_64.pkg.tar.xz (remote)
 7) harfbuzz-1.3.1-1-x86_64.pkg.tar.xz (remote)
 8) harfbuzz-1.3.0-1-x86_64.pkg.tar.xz (remote)
 9) harfbuzz-1.2.7-1-x86_64.pkg.tar.xz (remote)
 10) harfbuzz-1.2.6-1-x86_64.pkg.tar.xz (remote)
 11) harfbuzz-1.2.4-3-x86_64.pkg.tar.xz (remote)
 12) harfbuzz-1.2.4-1-x86_64.pkg.tar.xz (remote)
 13) harfbuzz-1.2.3-1-x86_64.pkg.tar.xz (remote)
 14) harfbuzz-1.2.1-1-x86_64.pkg.tar.xz (remote)
 15) harfbuzz-1.2.0-1-x86_64.pkg.tar.xz (remote)
 16) harfbuzz-1.1.3-1-x86_64.pkg.tar.xz (remote)
 17) harfbuzz-1.1.2-3-x86_64.pkg.tar.xz (remote)
 18) harfbuzz-1.1.2-2-x86_64.pkg.tar.xz (remote)
 19) harfbuzz-1.1.2-1-x86_64.pkg.tar.xz (remote)
 20) harfbuzz-1.1.1-1-x86_64.pkg.tar.xz (remote)
 21) harfbuzz-1.1.0-1-x86_64.pkg.tar.xz (remote)
 22) harfbuzz-1.0.6-2-x86_64.pkg.tar.xz (remote)
 23) harfbuzz-1.0.6-1-x86_64.pkg.tar.xz (remote)
 24) harfbuzz-1.0.5-1-x86_64.pkg.tar.xz (remote)
 25) harfbuzz-1.0.4-1-x86_64.pkg.tar.xz (remote)
 26) harfbuzz-1.0.3-1-x86_64.pkg.tar.xz (remote)
 27) harfbuzz-1.0.1-1-x86_64.pkg.tar.xz (remote)
 28) harfbuzz-0.9.41-1-x86_64.pkg.tar.xz (remote)
 29) harfbuzz-0.9.40-2-x86_64.pkg.tar.xz (remote)
 30) harfbuzz-0.9.40-1-x86_64.pkg.tar.xz (remote)
 31) harfbuzz-0.9.38-1-x86_64.pkg.tar.xz (remote)
 32) harfbuzz-0.9.37-1-x86_64.pkg.tar.xz (remote)
 33) harfbuzz-0.9.36-1-x86_64.pkg.tar.xz (remote)
 34) harfbuzz-0.9.35-2-x86_64.pkg.tar.xz (remote)
 35) harfbuzz-0.9.35-1-x86_64.pkg.tar.xz (remote)
 36) harfbuzz-0.9.32-1-x86_64.pkg.tar.xz (remote)
 37) harfbuzz-0.9.30-1-x86_64.pkg.tar.xz (remote)
 38) harfbuzz-0.9.29-1-x86_64.pkg.tar.xz (remote)
 39) harfbuzz-0.9.28-1-x86_64.pkg.tar.xz (remote)
 40) harfbuzz-0.9.26-2-x86_64.pkg.tar.xz (remote)
 41) harfbuzz-0.9.26-1-x86_64.pkg.tar.xz (remote)
 42) harfbuzz-0.9.24-1-x86_64.pkg.tar.xz (remote)
 43) harfbuzz-0.9.23-1-x86_64.pkg.tar.xz (remote)
 44) harfbuzz-0.9.22-1-x86_64.pkg.tar.xz (remote)
 45) harfbuzz-0.9.19-1-x86_64.pkg.tar.xz (remote)
select a package by number: 3
[1/2]: https://archive.archlinux.org/packages/h/harfbuzz/harfbuzz-1.3.4-1-x86_64.pkg.tar.xz --> harfbuzz-1.3.4-1-x86_64.pkg.tar.xz
 --_curl_--https://archive.archlinux.org/packages/h/harfbuzz/harfbuzz-1.3.4-1-x86_64.pkg.tar.xz
 % Total % Received % Xferd Average Speed Time Time Time Current
 Dload Upload Total Spent Left Speed
 100 298k 100 298k 0 0 120k 0 0:00:02 0:00:02 --:--:-- 120k
[2/2]: https://archive.archlinux.org/packages/h/harfbuzz/harfbuzz-1.3.4-1-x86_64.pkg.tar.xz.sig --> harfbuzz-1.3.4-1-x86_64.pkg.tar.xz.sig
 --_curl_--https://archive.archlinux.org/packages/h/harfbuzz/harfbuzz-1.3.4-1-x86_64.pkg.tar.xz.sig
 100 310 100 310 0 0 1562 0 --:--:-- --:--:-- --:--:-- 1562
 loading packages...
 warning: downgrading package harfbuzz (1.4.1-1 => 1.3.4-1)
 resolving dependencies...
 looking for conflicting packages...
Packages (1) harfbuzz-1.3.4-1
Total Installed Size: 2.25 MiB
 Net Upgrade Size: -0.15 MiB
:: Proceed with installation? [Y/n] y
 (1/1) checking keys in keyring [##############] 100%
 (1/1) checking package integrity [##############] 100%
 (1/1) loading package files [##############] 100%
 (1/1) checking for file conflicts [##############] 100%
 (1/1) checking available disk space [##############] 100%
 :: Processing package changes...
 (1/1) downgrading harfbuzz [##############] 100%
 add harfbuzz to IgnorePkg? [y/n] y