Preparing to unpack .../0-apache2_2.4.29-1ubuntu4.2_amd64.deb ...
Unpacking apache2 (2.4.29-1ubuntu4.2) over (2.4.29-1ubuntu4.1) ...
Preparing to unpack .../1-apache2-bin_2.4.29-1ubuntu4.2_amd64.deb ...
Unpacking apache2-bin (2.4.29-1ubuntu4.2) over (2.4.29-1ubuntu4.1) ...
dpkg-deb: unrecoverable fatal error, aborting:
 fork failed: Resource temporarily unavailable
dpkg: error processing archive /tmp/apt-dpkg-install-TemOpm/2-apache2-utils_2.4.29-1ubuntu4.2_amd64.deb (--unpack):
 dpkg-deb --control subprocess returned error exit status 2