操作系统：Ubuntu 20.04
我欢迎任何解决此问题的建议/解决方案。
使用快照，我可以删除快照，但是当我想安装任何快照时，出现以下错误：
$ sudo snap install darktable
[sudo] password for aaron:
error: cannot perform the following tasks:
- Run configure hook of "darktable" snap if present (run hook "configure":
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Fontconfig error: "/etc/fonts/conf.d/69-unifont.conf", line 6: invalid attribute 'xmlns:its'
Fontconfig error: "/etc/fonts/conf.d/69-unifont.conf", line 6: invalid attribute 'version'
Fontconfig warning: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 4: unknown element "its:rules"
Fontconfig warning: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 5: unknown element "its:translateRule"
Fontconfig error: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 5: invalid attribute 'translate'
Fontconfig error: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 5: invalid attribute 'selector' …