sudo nixos-rebuild boot --upgrade --show-trace
unpacking channels...
building Nix...
building the system configuration...
error: while evaluating the attribute 'activationScript' of the derivation 'nixos-system-hermes-18.09.1834.9d608a6f592' at /nix/store/simdw3hm4l2visx96bk86k1vml2h9s1a-nixos-18.09.1834.9d608a6f592/nixos/pkgs/stdenv/generic/make-derivation.nix:177:11:
while evaluating the attribute 'system.activationScripts.script' at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/activation-script.nix:67:9:
while evaluating 'textClosureMap' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/strings-with-deps.nix:70:35, called from /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/activation-script.nix:88:18:
while evaluating 'id' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/trivial.nix:14:5, called from undefined position:
while evaluating the attribute 'text' at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/activation-script.nix:9:5:
while evaluating the attribute 'text' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/strings-with-deps.nix:77:38:
while evaluating the attribute 'sources' of the derivation 'etc' at /nix/store/simdw3hm4l2visx96bk86k1vml2h9s1a-nixos-18.09.1834.9d608a6f592/nixos/pkgs/stdenv/generic/make-derivation.nix:177:11:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/etc/etc.nix:20:20, called from undefined position:
while evaluating the attribute 'source' at undefined position:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:75:45, called from undefined position:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:336:9:
while evaluating the option `environment.etc.sddm.conf.source':
while evaluating the attribute 'mergedValue' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:369:5:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:369:32, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:369:19:
while evaluating 'check' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:240:15, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:370:10:
while evaluating the attribute 'text' of the derivation 'sddm.conf' at /nix/store/simdw3hm4l2visx96bk86k1vml2h9s1a-nixos-18.09.1834.9d608a6f592/nixos/pkgs/stdenv/generic/make-derivation.nix:177:11:
while evaluating the attribute 'text' of the derivation 'xserver-wrapper' at /nix/store/simdw3hm4l2visx96bk86k1vml2h9s1a-nixos-18.09.1834.9d608a6f592/nixos/pkgs/stdenv/generic/make-derivation.nix:177:11:
while evaluating 'concatMapStrings' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/strings.nix:31:25, called from /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/services/x11/display-managers/sddm.nix:16:7:
while evaluating the attribute 'systemd.services.display-manager.environment' at undefined position:
attribute 'display-manager' missing, at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/services/x11/display-managers/sddm.nix:10:10
hook@hermes:~