[Ubuntu-BR] Erro na atualizaçao

[Danny - Gmail]

Olá,

Preciso atualizar o mysql e está dando erro, tentei dar um apt-get -f 
install e está me retornando o seguinte:
Alguem sabe oq pode ser?

inetserver: apt-get -f install
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
  diff
Suggested packages:
  diff-doc
The following packages will be upgraded:
  diff
1 upgraded, 0 newly installed, 0 to remove and 348 not upgraded.
1 not fully installed or removed.
Need to get 0B/185kB of archives.
After unpacking 551kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Selecting previously deselected package diff.
(Reading database ... 26887 files and directories currently installed.)
Preparing to replace diff 2.7-29 (using .../diff_2.8.1-11_i386.deb) ...
install-info: failed to lock dir for editing! Read-only file system
dpkg: warning - old pre-removal script returned error exit status 30
dpkg - trying script from the new package instead ...
dpkg: error processing /var/cache/apt/archives/diff_2.8.1-11_i386.deb 
(--unpack):
 there is no script in the new version of the package - giving up
install-info: failed to lock dir for editing! Read-only file system
dpkg: error while cleaning up:
 subprocess post-installation script returned error exit status 30
Errors were encountered while processing:
 /var/cache/apt/archives/diff_2.8.1-11_i386.deb
  localepurge: processing locale files ...
E: Sub-process /usr/bin/dpkg returned an error code (1)