You have an odd looking share definition at the end of your smb.conf:
[]
path = /home/kschindl/samba/
valid users = kschindl
read only = no
I think "" was meant to be replaced by something else.
In addition do that, testparm is complaining about your "map to guest" choice:
WARNING: Ignoring inva
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1693651
Title:
package samba 2:4.4.5+dfsg-2ubuntu5.6 failed to install/upgrade:
subprocess installed post-instal