Pls. help! Updating stopped functioning!

[UUUnicorn]

Now I'm getting this when I try to update my system:

Setting up lite-software (5.0-0040-linuxlite) ...
  % Total    % Received % Xferd  Average Speed  Time    Time    Time  Current
                                Dload  Upload  Total  Spent    Left  Speed
100  1743  100  1743    0    0  7851      0 --:--:-- --:--:-- --:--:--  7851
gpg: invalid key resource URL '/etc/apt/trusted.gpg.d/hometevenpusser.gpg'
gpg: keyblock resource '(null)': General error
gpg: key 0FAD31CA8719FCE4: 1 signature not checked due to a missing key
gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
gpg: Total number processed: 11
gpg:      skipped new keys: 11
dpkg: error processing package lite-software (--configure):
installed lite-software package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
lite-software
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up lite-software (5.0-0040-linuxlite) ...
  % Total    % Received % Xferd  Average Speed  Time    Time    Time  Current
                                Dload  Upload  Total  Spent    Left  Speed
100  1743  100  1743    0    0  19153      0 --:--:-- --:--:-- --:--:-- 19153
gpg: invalid key resource URL '/etc/apt/trusted.gpg.d/hometevenpusser.gpg'
gpg: keyblock resource '(null)': General error
gpg: key 0FAD31CA8719FCE4: 1 signature not checked due to a missing key
gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
gpg: Total number processed: 11
gpg:      skipped new keys: 11
dpkg: error processing package lite-software (--configure):
installed lite-software package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
lite-software

Please, if I need to do a complete reinstallation, please do tell me. Thank you very, very much for any and all advice and help.

Yours truly,

UUUnicorn