I have installed w3c-markup-validator on Ubuntu 14.04 with this command:
sudo apt-get install w3c-markup-validator
After that, each time I run apt-get update, apt-get upgrade or apt-get install I get following error:
dpkg: error processing package w3c-markup-validator
Errors were encountered while processing:
w3c-markup-validator
E: Sub-process /usr/bin/dpkg returned an error code (1)
Initially, I thought that it had something to do with the fact that there were some issues with w3c-markup-validator related to newer Apache version, but even after fixing those issues as stated in Install wc3 markup validator locally, this error message still occurs every time I use apt-get.
Is there any way to supress this one error message? Optionally, what might be cause of this error message?