garbled output with truetype fonts

In 17.10 I printed with enscript using the truetype font "DejaVuSansMono" without any difficulties. (I had set up the appropriate afm files and edited font.map.)

After upgrading to 18.04 enscript produces output that is garbled, with incorrect glyphs or squares replacing most of the characters in the output. Other applications such as libreoffice print using DejaVu fonts without difficulty. Enscript still works fine with the fonts it came with as far as my testing shows. So Bookman and the default font both work. But Liberation (another truetype font) also fails.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: enscript 1.6.5.90-3 [modified: usr/share/enscript/afm/font.map]
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Mon Jun 18 22:23:57 2018
InstallationDate: Installed on 2014-04-19 (1521 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: enscript
UpgradeStatus: Upgraded to bionic on 2018-06-09 (9 days ago)