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I've reported long time ago, got an immutable response that "they're working on it but don't have an ETA"! That's what Parallels have done every time.
14 does not make much difference on Linux support except for the new UI.
You don't really resolve my issue for my and others' Guest OSes, from my prospective. See another post of mine...
The hotfix or unofficial one https://gist.github.com/rudolfratusinski/a4d9e3caff11a4d9d81d2e84abc9afbf might resolves some of your issues....
``` 2018年 02月 08日 星期四 15:45:18 CST Start installation or upgrade of Guest Tools new version of parallels tools Installed Guest Tools were not...