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I completely removed my NetworkManager with all dependencies (and I have no idea what this includes). But I managed to reinstall my NetworkManager, to edit my interface file, an no have access to the internet by LAN (I have to execute dhclient manual form terminal.).
Is there a way to reinstall just the unknown removed default packages an stuff without overwriting my customized system (personal files, thunderbird, firefox, drivers, ...)? I have read about sudo apt-get install ubuntu-minimal, ubuntu-standard or ubuntu-desktop, but I'm not sure which of these fits best or if there better ways (especially for Xubuntu).

I use:
Kernel: 5.2.21-050221-generic
Ubuntu 18.04.3 LTS
Xfce 4.12
NetworkManager version: 1.10.6-2ubuntu1.1

Thanks to everybody!

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    Are you running Xubuntu 18.04? XFCE 4.14 didn't come out till Xubuntu 19.10, so your XFCE version doesn't fit the XFCE version found in 18.04. The xubuntu-desktop may be the package you want (packages.ubuntu.com/bionic/xubuntu-desktop) however it sounds like you've made an error (4.12? with parts of 4.13) or have added later packages and this may not fix your system - so checking ubuntu-support-status maybe worthwhile (you may no longer have a LTS system) – guiverc Oct 29 at 0:26
  • You are right. Sorry, transcript error. Xfce 4.12, that is what xfce4-abouttells me. The rest should be updates from apt (and packages like nautilus). – noixificurc Oct 29 at 0:46
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I figured it out by my self.
Since I had stable internet I was able to use sudo apt-get install --reinstall ubuntu-desktop and reboot. Then I did all kinds of update, upgrade, dist-upgrade and install -f. After another reboot I followed the steps under Issues. An everything seems to be as before.

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