Even though I press "Y" apt-get sometimes exits

[Tommaso Fonda]

On Ubuntu GNOME 14.04 with apt 1.0.x, apt-get exits even though I press Y when prompted. This happened to me rarely, maybe 1 time out of 20, but I'm not sure. It may be a random behaviour.
Unfortunately, there's no log of this faulty behaviour in /var/log/apt/term.log, but here's an example:

sudo apt-get dist-upgrade
...
...
...
Do you want to continue? [Y/n] y
exiting.

My system uses Italian language, so these might not be the exac translation.
Thank you!

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: apt 1.0.1ubuntu2
Uname: Linux 3.14.1-031401-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: GNOME
Date: Tue May 6 16:51:27 2014
InstallationDate: Installed on 2014-04-14 (22 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Daily amd64 (20140412)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)

[William Lee (wlee753159)]

Sorry that you only just got attention to this problem. Did you type anything before the choice entry because sometimes I type accidentally a character before the choice entry and I type 'y' in and press Enter and it says Abort.' But I realise that I accidentally type a character before.