root@ip-10-36-103-96:~# sudo apt-get remove ttf-freefont ttf-dejavu-core
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package ttf-freefont is not installed, so not removed
The following extra packages will be installed:
  ttf-bitstream-vera
The following packages will be REMOVED:
  ttf-dejavu-core
The following NEW packages will be installed:
  ttf-bitstream-vera
0 upgraded, 1 newly installed, 1 to remove and 247 not upgraded.
Need to get 0 B/352 kB of archives.
After this operation, 2,173 kB disk space will be freed.
Do you want to continue [Y/n]?
WARNING: The following packages cannot be authenticated!
  ttf-bitstream-vera
Authentication warning overridden.
Selecting previously unselected package ttf-bitstream-vera.
(Reading database ... 51526 files and directories currently installed.)
Unpacking ttf-bitstream-vera (from .../ttf-bitstream-vera_1.10-8_all.deb) ...
Processing triggers for fontconfig ...
Setting up ttf-bitstream-vera (1.10-8) ...
(Reading database ... 51544 files and directories currently installed.)
Removing ttf-dejavu-core ...
Processing triggers for fontconfig ...