[rokka@derGeraet:~]$ sudo -i nixos-rebuild switch --upgrade
unpacking channels...
created 5 symlinks in user environment
building Nix...
building the system configuration...
these derivations will be built:
  /nix/store/zga9fq5b4djandw5nn93sgz7yjcpxfhy-python3.6-rlp-1.0.2.drv
  /nix/store/lswiypxg4fqhmm3z9aq1ddvhp89n9y6c-python3.6-trezor-0.10.2.drv
  /nix/store/07h8r3r0a504p1jgvr4xn050n1mm5560-python3.6-keepkey-4.0.0.drv
  /nix/store/543b9z285r1vqy47rzhpk7qk2xg82nx6-electrum-3.1.3.drv
  /nix/store/gs9ngljbb3g91bd4xa6q8s3pncm8gjpa-system-path.drv
  /nix/store/1jrs1z23dnw95kxp5zkin9yi29i7m2lw-unit-accounts-daemon.service.drv
  /nix/store/aqkkjnqb36pagvk9i7a0ykk3aph9nphq-dbus-1.drv
  /nix/store/gv30m6806dyn14s9wf87cb3h3j3k3ms2-unit-polkit.service.drv
  /nix/store/rc5j8zjsxv442jgh40y4mw4pzh3x752m-unit-dbus.service.drv
  /nix/store/sm3kxxzysp5nsbxrsz3v4gnk8268bh85-unit-systemd-fsck-.service.drv
  /nix/store/kv3h6brywi8bzf85nhr9wjl6gjgbv5dq-system-units.drv
  /nix/store/innhlpycssycrdqr33rb9b9fz5v8mcc9-unit-dbus.service.drv
  /nix/store/psvv183w0v5pqi6iabm35j34iy1qwyh5-user-units.drv
  /nix/store/bv6pmx3yha5m39l5rl2kp41h0i5jzbw6-etc.drv
  /nix/store/8y44h3kggf99yk5jm3402wmq60slvj5g-nixos-system-derGeraet-19.03pre151875.7c1b85cf6de.drv
building '/nix/store/zga9fq5b4djandw5nn93sgz7yjcpxfhy-python3.6-rlp-1.0.2.drv'...
unpacking sources
unpacking source archive /nix/store/a7ya97nqwdfhb29nl0favidb9kgfcy5q-rlp-1.0.2.tar.gz
source root is rlp-1.0.2
setting SOURCE_DATE_EPOCH to timestamp 1533583668 of file rlp-1.0.2/setup.cfg
patching sources
configuring
building
Download error on https://pypi.org/simple/setuptools-markdown/: [Errno -2] Name or service not known -- Some packages may not be found!
Couldn't find index page for 'setuptools-markdown' (maybe misspelled?)
Download error on https://pypi.org/simple/: [Errno -2] Name or service not known -- Some packages may not be found!
No local packages or working download links found for setuptools-markdown
Traceback (most recent call last):
  File "nix_run_setup", line 8, in <module>
    exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\\r\\n', '\\n'), __file__, 'exec'))
  File "setup.py", line 67, in <module>
    'Programming Language :: Python :: Implementation :: PyPy',
  File "/nix/store/8ng1kdflixqzwwbd705nlm1ry4pwfmcp-python3.6-bootstrapped-pip-18.0/lib/python3.6/site-packages/setuptools/__init__.py", line 139, in setup
    _install_setup_requires(attrs)
  File "/nix/store/8ng1kdflixqzwwbd705nlm1ry4pwfmcp-python3.6-bootstrapped-pip-18.0/lib/python3.6/site-packages/setuptools/__init__.py", line 134, in _install_setup_requires
    dist.fetch_build_eggs(dist.setup_requires)
  File "/nix/store/8ng1kdflixqzwwbd705nlm1ry4pwfmcp-python3.6-bootstrapped-pip-18.0/lib/python3.6/site-packages/setuptools/dist.py", line 514, in fetch_build_eggs
    replace_conflicting=True,
  File "/nix/store/8ng1kdflixqzwwbd705nlm1ry4pwfmcp-python3.6-bootstrapped-pip-18.0/lib/python3.6/site-packages/pkg_resources/__init__.py", line 777, in resolve
    replace_conflicting=replace_conflicting
  File "/nix/store/8ng1kdflixqzwwbd705nlm1ry4pwfmcp-python3.6-bootstrapped-pip-18.0/lib/python3.6/site-packages/pkg_resources/__init__.py", line 1060, in best_match
    return self.obtain(req, installer)
  File "/nix/store/8ng1kdflixqzwwbd705nlm1ry4pwfmcp-python3.6-bootstrapped-pip-18.0/lib/python3.6/site-packages/pkg_resources/__init__.py", line 1072, in obtain
    return installer(requirement)
  File "/nix/store/8ng1kdflixqzwwbd705nlm1ry4pwfmcp-python3.6-bootstrapped-pip-18.0/lib/python3.6/site-packages/setuptools/dist.py", line 581, in fetch_build_egg
    return cmd.easy_install(req)
  File "/nix/store/8ng1kdflixqzwwbd705nlm1ry4pwfmcp-python3.6-bootstrapped-pip-18.0/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 670, in easy_install
    raise DistutilsError(msg)
distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('setuptools-markdown')
builder for '/nix/store/zga9fq5b4djandw5nn93sgz7yjcpxfhy-python3.6-rlp-1.0.2.drv' failed with exit code 1
cannot build derivation '/nix/store/lswiypxg4fqhmm3z9aq1ddvhp89n9y6c-python3.6-trezor-0.10.2.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/543b9z285r1vqy47rzhpk7qk2xg82nx6-electrum-3.1.3.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/gs9ngljbb3g91bd4xa6q8s3pncm8gjpa-system-path.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/8y44h3kggf99yk5jm3402wmq60slvj5g-nixos-system-derGeraet-19.03pre151875.7c1b85cf6de.drv': 1 dependencies couldn't be built
error: build of '/nix/store/8y44h3kggf99yk5jm3402wmq60slvj5g-nixos-system-derGeraet-19.03pre151875.7c1b85cf6de.drv' failed