nixos-rebuild switch --upgrade

opying path '/nix/store/y9z3yv6q4w3izbc8nlm9lcabnnmclm7x-qtkeychain-qt5-0.9.1' from 'https://cache.nixos.org'...
copying path '/nix/store/1p4di1ad9kk73k1cq5yss3mqwh5kv8v9-qtlocation-5.11.3' from 'https://cache.nixos.org'...
copying path '/nix/store/yzbrinikvvyj9v5s2nm1q412vzsmxcly-qtmultimedia-5.11.3' from 'https://cache.nixos.org'...
warning: unable to download 'https://cache.nixos.org/nar/1cngd4hpvxxnvh5cdhh2y26hv8w9sgn3j4b0giw4n0mafvcdhsdh.nar.xz': HTTP error 200 (curl error: Failure when receiving data from the peer); retrying in 257 ms
warning: unable to download 'https://cache.nixos.org/nar/0g097fl6mwryaavixw16w1f4v9izfyggv19qizk2hjmgp3va1k98.nar.xz': HTTP error 200 (curl error: Transferred a partial file); retrying in 333 ms
warning: unable to download 'https://cache.nixos.org/nar/1lqfxpwxr27jn5ca5pxms33lbfgbq9h564fsa3bnfc8j6003cyyd.nar.xz': HTTP error 200 (curl error: Transferred a partial file); retrying in 323 ms
copying path '/nix/store/jlcv5lkis8kff20qzk63wnsdfsn7bybx-qtscript-5.11.3' from 'https://cache.nixos.org'...
error 9 while decompressing xz file
copying path '/nix/store/13aq7myjis5v4dgsy1fnj5zjf73603hf-qtsensors-5.11.3' from 'https://cache.nixos.org'...
copying path '/nix/store/892frs8hipxrybg46vj0bwccgjpbfl5x-qtsvg-5.11.3' from 'https://cache.nixos.org'...
cannot build derivation '/nix/store/36viny2shzvrmpq28alsb5vsmdjc328c-system-path.drv': 1 dependencies couldn't be built
copying path '/nix/store/3k9dqx1lcz7ys6pfk985867cydy92yr1-qtwebchannel-5.11.3' from 'https://cache.nixos.org'...
copying path '/nix/store/kddrym3z5djhmgjpdihcpbzw449hj8a6-qtx11extras-5.11.3' from 'https://cache.nixos.org'...
building '/nix/store/m1jn4lnn80qn28l736wk9x9a7j14z8s6-unit-docker.service.drv'...
cannot build derivation '/nix/store/spgnvmna5a2hapg82gcdd9sss2h8vrkc-nixos-system-horst-18.09.2337.5d972dd2c94.drv': 1 dependencies couldn't be built
error: build of '/nix/store/spgnvmna5a2hapg82gcdd9sss2h8vrkc-nixos-system-horst-18.09.2337.5d972dd2c94.drv' failed