[root@nixos:/]# nixos-rebuild switch
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
building Nix...
building the system configuration...
these derivations will be built:
  /nix/store/09nj9zgr1q9vjlfixsh9y6v46grnl6xh-system-path.drv
  /nix/store/z4fabc26wg044z1dkis6abxnrzdwgdri-dbus-1.drv
  /nix/store/0qgfinhi6w1kmxfg4am3fg6x77kkx4ji-unit-dbus.service.drv
  /nix/store/dirwk8qnq511bmmij70ygvn48r8vvaiz-etc-nsswitch.conf.drv
  /nix/store/20hyi0gjflfbx4hdcqmcxm3az5simlzn-unit-nscd.service.drv
  /nix/store/4ijkdlkkas3p6whwbaxmqnmyk7ha25gc-unit-dbus.service.drv
  /nix/store/4v604cz2sv8pxr068236scqjwkrnry70-unit-net-connman-vpn.service.drv
  /nix/store/51gzf427ia0bgzyjqd4ybgzyr03z3xnh-unit-systemd-fsck-.service.drv
  /nix/store/8l3gkw9myy4qalb457fplkxvlwlbp5kp-extra-udev-rules.drv
  /nix/store/7aq0g5zcck3w5xg54qnmh3ppkp3znxx9-hwdb.bin.drv
  /nix/store/9k6wqqsk49xi7wp8b0hc3pqrsjxlxjc4-unit-polkit.service.drv
  /nix/store/a13n56n13v6f77vr45q05smbxdijn30h-udev-rules.drv
  /nix/store/b5yhjglgqy374l0dp5qv4h27bnvydf6a-connman.conf.drv
  /nix/store/ck60rmzz1h37alg4zkc7db3hiyji5s73-unit-script-wpa_supplicant-start.drv
  /nix/store/f3w4x03va4gs6g9f9pvn8w8pyi1zwddi-user-units.drv
  /nix/store/gjjfiw5b9vyndsnqzfj7jl4m5hp9yaz1-etc-unnamed-12.1.drv
  /nix/store/hyd8hm1jrr7f6wih4ypk7fqbp5r24zfv-unit-connman.service.drv
  /nix/store/nizbxv0czahzc684z02325bi40q7nd23-unit-connman-vpn.service.drv
  /nix/store/n324zvpdd72b3xnga6ljf51pzbwbzlqj-etc-resolved.conf.drv
  /nix/store/np19kds4jsv31xbaq1ial02ihagfplrw-unit-systemd-resolved.service.drv
  /nix/store/r4ki4scv0anijbwk5hxg3ac6dzg7hbbk-unit-wpa_supplicant.service.drv
  /nix/store/nj4vin9192n97zlncsm8ypa2wl5wv45y-unit-script-post-resume-start.drv
  /nix/store/s6fwdwdgb0kx88z89fdpzkx91l9lfq9p-unit-post-resume.service.drv
  /nix/store/vdwh4anl51dj2vwansvwsafr6h5jphqi-unit-systemd-udevd.service.drv
  /nix/store/hb5r52nicpnwclmi5r651n8q5xsy5cfc-system-units.drv
  /nix/store/vqx5b2zc8rvlb3wygyds7gad4whrf1g3-etc.drv
  /nix/store/gncc7kd802vcz5frdgxcgvmfssvd8csa-nixos-system-nixos-18.09.1676.7e88992a8c7.drv
these paths will be fetched (4.40 MiB download, 10.37 MiB unpacked):
  /nix/store/225ywdyinplz0nxpn468xgriqm280sha-wpa_supplicant-2.6
  /nix/store/27hdnrj283g6n7ivi8kidg7qv6yfm7qk-pptp-1.10.0
  /nix/store/462vig5raxg89pgh3d1v3n1kdjz5v0fp-iw-4.14
  /nix/store/g211x8x3dsxdhqhpsh45l1dhb7gqlh2b-connman-1.36
  /nix/store/g7659aplncy552q5pazqyy7v8nan9iqy-libnl-3.4.0
  /nix/store/ghyp6jg0cz32cbksnds41zds91ksmgci-cmst-2018.01.06
  /nix/store/lw4v0fmr6jr1zwhsyffqrhqqi31pq9pa-openvpn-2.4.6
  /nix/store/viflbjxy3kqdrilkzxjmbv5l30animpn-wireless-tools-30.pre2
  /nix/store/xskk1rd4nm5a7sgznlfdzswf9b2sfh6m-rfkill-0.5
error: cloning builder process: Operation not permitted
error: unable to start build process