`python3 -m venv venv` instructs you to install python3-venv which doesn't exist

The python3.4-venv package does exist; python3-venv was introduced in python3-defaults 3.4.1-1 in Debian.

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root@trusty-py3-venv:~# python3 -m venv .venv
The virtual environment was not created successfully because ensurepip is not
available. On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.

    apt-get install python3-venv

You may need to use sudo with that command. After installing the python3-venv
package, recreate your virtual environment.

root@trusty-py3-venv:~# apt-get install python3-venv
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python3-venv

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: python3.4 3.4.3-1ubuntu1~14.04.3
ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4
Uname: Linux 3.19.0-26-generic x86_64
NonfreeKernelModules: btrfs xor raid6_pq ufs msdos xfs libcrc32c binfmt_misc veth ip6table_filter ip6_tables xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables ppdev parport_pc parport serio_raw dm_multipath scsi_dh autofs4 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse virtio_scsi
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Fri Jan 8 15:10:13 2016
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
SourcePackage: python3.4
UpgradeStatus: No upgrade log present (probably fresh install)