auctex not found by emacs

[Jeff Abrahamson]

In ubuntu 19.04 with emacs 26.1, typing "M-x auctex" is not a valid command. This is reproducible even starting as "emacs -q". I've also tried evaluating (load "auctex"), which returns true, but the command "auctex" remains unavailable.

The variable AUCTeX-version has value 11.91.
The variable AUCTeX-date has value 2017-07-24.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: auctex 11.91-1ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-21.22-generic 5.0.15
Uname: Linux 5.0.0-21-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
CurrentDesktop: i3
Date: Sun Aug 4 21:16:49 2019
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-10-23 (1381 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: auctex
UpgradeStatus: Upgraded to disco on 2019-07-30 (5 days ago)