Create README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

admin/linux/fedora_dnf/README.md

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+# When dnf fails.
+
+## Top
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+Let us assume the dnf update inbetween. You lost the remote connection to the computer where the update was running or systemd oom killed the dnf task. 
+
+Now you are stuck in dnf limbo. How to get out of it with less effort as possible?  
+
+
+### Try 1
+
+```shell
+dnf -y remove --duplicates 2> error.log
+cat error.log | awk -F 'from install of|conflicts with file from package' '{print $2}' | sort -u | awk 'NF' | sed s/"^ "/"dnf -y reinstall "/g | sh
+```
+
+### Try 2
+
+```shell
+dnf -y remove --duplicates 2> error.log
+cat error.log | awk -F 'from install of|conflicts with file from package' '{print $2}' | sort -u | awk 'NF' 
+```