sudo apt-get upgrade

[SiM]

Is it worth doing this on my Ubuntu fileserver if everything is working 100% perfectly? Is there a chance that a new version of something could break something?

It wants to make some big changes...

The following packages will be upgraded:
  apt apt-utils base-files grub initramfs-tools libcupsys2 libdbus-1-3
  libgnutls13 libgtk2.0-0 libgtk2.0-common liblcms1 libmysqlclient15off
  libpam-smbpass libperl5.8 libpq5 libsensors4 libsnmp-base libsnmp15 libxml2
  linux-libc-dev lm-sensors login logrotate module-init-tools mysql-client
  mysql-client-5.0 mysql-common mysql-server mysql-server-5.0 passwd perl
  perl-base perl-modules php-pear php5 php5-cgi php5-cli php5-common php5-curl
  php5-gd php5-mhash php5-mysql php5-pspell php5-recode php5-snmp php5-sqlite
  php5-tidy php5-xmlrpc php5-xsl python-apt samba samba-common samba-doc
  smbclient smbfs tzdata winbind xkb-data

[peterb]

Yes it is. There are new vulnerabilities being discovered in *nix software as in the various versions of Windows, so it is always worth upgrading.

Yes there is a risk that something might break, although (<sweeping generalisaition mode>) Linux developers are pretty good at regression testing (</sweeping generalisation made>) but that is a risk you run with most software upgrades.

New releases often introduce new features or correct previous incompatabilities (as well as fixing sy vulnerabilities) so yes - upgrade.

[SiM]

Thanks peterb, I will take the plunge tomorrow. If it breaks, I will post back here moaning

[directhex]

"upgrade" on a stable release contains ONLY bug and security fixes.

It does NOT change your distro to a later version. Therefore risk of regressions is low.