Why my kernel is not the latest for 14.04?

Question

My kernel is currently

Linux scv 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

But I know it should be

3.13.0-45-generic #74

Why is it not updated by default on my pc upon execution of

sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade

Any idea? How can I fix this?

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EDIT:

executing

ema@scv:~$ cat /etc/issue
Ubuntu 14.04.2 LTS \n \l

reports 14.04.2 apparently...

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EDIT2:

on my other computer, with a fresher install of Ubuntu 14.04, I got 3.13.0-45-generic #74...

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EDIT3:

all the repos/ppa

ema@scv:~$ grep -h ^deb /etc/apt/sources.list /etc/apt/sources.list.d/*
deb http://gb.archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty main restricted
deb http://gb.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb http://gb.archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty universe
deb http://gb.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb http://gb.archive.ubuntu.com/ubuntu/ trusty multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://gb.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb http://gb.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
deb http://security.ubuntu.com/ubuntu trusty-security universe
deb-src http://security.ubuntu.com/ubuntu trusty-security universe
deb http://security.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main
deb http://ppa.launchpad.net/maarten-baert/simplescreenrecorder/ubuntu trusty main
deb http://ppa.launchpad.net/maarten-baert/simplescreenrecorder/ubuntu trusty main
deb http://ppa.launchpad.net/osmoma/audio-recorder/ubuntu trusty main
deb http://ppa.launchpad.net/osmoma/audio-recorder/ubuntu trusty main
deb http://ppa.launchpad.net/pipelight/stable/ubuntu trusty main
deb http://ppa.launchpad.net/stebbins/handbrake-snapshots/ubuntu trusty main
deb http://ppa.launchpad.net/stebbins/handbrake-snapshots/ubuntu trusty main
deb http://ppa.launchpad.net/stefansundin/truecrypt/ubuntu trusty main
deb http://ppa.launchpad.net/stefansundin/truecrypt/ubuntu trusty main
deb http://ppa.launchpad.net/sunab/kdenlive-release/ubuntu trusty main
deb http://ppa.launchpad.net/sunab/kdenlive-release/ubuntu trusty main
deb http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu trusty main
deb http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu trusty main
deb http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu trusty main
deb http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu trusty main

Answer 1

Apparently I didn't have the meta package linux-generic installed... A simple

sudo apt-get install linux-generic && sudo apt-get install --reinstall nvidia-346

Did the trick!
Amazing, didn't think I somehow managed to remove that meta-package...

Now I got

ema@scv:~$ uname -a
Linux scv 3.13.0-46-generic #75-Ubuntu SMP Tue Feb 10 15:24:04 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Result!

Answer 2

First run the cat /etc/issue command to verify what Ubuntu version do you have. I have the same kernel as you do, but my kernel Ubuntu version is 14.04. There is always a difference in between a kernel version and the distribution version.