$ sudo apt-get install apache2
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  www-browser apache2-doc apache2-suexec-pristine apache2-suexec-custom
The following NEW packages will be installed:
  apache2
0 upgraded, 1 newly installed, 0 to remove and 120 not upgraded.
Need to get 0 B/146 kB of archives.
After this operation, 471 kB of additional disk space will be used.
(Reading database ... 73715 files and directories currently installed.)
Preparing to unpack .../apache2_2.4.20-1+deb.sury.org~trusty+4_amd64.deb ...
Unpacking apache2 (2.4.20-1+deb.sury.org~trusty+4) ...
dpkg: error processing archive /var/cache/apt/archives/apache2_2.4.20-1+deb.sury.org~trusty+4_amd64.deb (--unpack):
 error setting ownership of `/var/www/html.dpkg-new': Operation not permitted
Processing triggers for ureadahead (0.100.0-16) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/apache2_2.4.20-1+deb.sury.org~trusty+4_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)