these 2 derivations will be built:
  /nix/store/1iws6mbjyrm4bdk2xffyv9n5i7m1b0d4-source.drv
  /nix/store/vvjvgpkv4pk7ql53hq5slqaig2gv63bf-cups-kyocera-ecosys-m552x-p502x-8.1602.drv
building '/nix/store/9im2nln7plcpz8469zb6g8vg3vvzibn7-source.drv'
source> 
source> trying https://www.kyoceradocumentsolutions.de/content/download-center/de/drivers/all/Linux_8_1602_ECOSYS_M5521_5526_P5021_5026_zip.download.zip
source>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
source>                                  Dload  Upload   Total   Spent    Left  Speed
source>   0  137k    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
source> curl: (22) The requested URL returned error: 404
source> error: cannot download source from any mirror
error: Cannot build '/nix/store/9im2nln7plcpz8469zb6g8vg3vvzibn7-source.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/3fhbr1m28y450bg3i91bq118gp8ccxv0-source
       Last 7 log lines:
       >
       > trying https://www.kyoceradocumentsolutions.de/content/download-center/de/drivers/all/Linux_8_1602_ECOSYS_M5521_5526_P5021_5026_zip.download.zip
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0  137k    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
       > curl: (22) The requested URL returned error: 404
       > error: cannot download source from any mirror
       For full logs, run:
         nix log /nix/store/9im2nln7plcpz8469zb6g8vg3vvzibn7-source.drv
error: build of resolved derivation '/nix/store/9im2nln7plcpz8469zb6g8vg3vvzibn7-source.drv' failed
error: Cannot build '/nix/store/vvjvgpkv4pk7ql53hq5slqaig2gv63bf-cups-kyocera-ecosys-m552x-p502x-8.1602.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/ci3gb2fvq28imc5jg68a027zn6i7hbsh-cups-kyocera-ecosys-m552x-p502x-8.1602