I am in this part:

Code:
apt-get update
After typing in the above, I got returned with this.

Code:
blah, blah, blah
]open file /var/lib/apt/lists/partial/ftp.de.debian.org_pub_debian_dists_testing_main_source_Sources                                           - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/pub/debian/...rce/Sources.gz  Could n                                          ot open file /var/lib/apt/lists/partial/ftp.de.debian.org_pub_debian_dists_testing_contrib_source_So                                          urces - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/pub/debian/...rce/Sources.gz  Could                                           not open file /var/lib/apt/lists/partial/ftp.de.debian.org_pub_debian_dists_testing_non-free_source_                                          Sources - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...86/Packages.gz  Could n                                          ot open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_unstable_main_binary-i386_Pac                                          kages - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...86/Packages.gz  Coul                                          d not open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_unstable_contrib_binary-i3                                          86_Packages - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...86/Packages.gz  Cou                                          ld not open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_unstable_non-free_binary-                                          i386_Packages - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...rce/Sources.gz  Could not ope                                          n file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_unstable_main_source_Sources - open                                           (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...rce/Sources.gz  Could not                                           open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_unstable_contrib_source_Sources                                           - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...rce/Sources.gz  Could not                                           open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_unstable_non-free_source_Source                                          s - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...ary-i386/Packa                                          ges.gz  Could not open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_.._project_exp                                          erimental_main_binary-i386_Packages - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...binary-i386/Pa                                          ckages.gz  Could not open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_.._project_                                          experimental_contrib_binary-i386_Packages - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist.../binary-i386/P                                          ackages.gz  Could not open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_.._project                                          _experimental_non-free_binary-i386_Packages - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...rce/Sources.gz                                            Could not open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_.._project_experimen                                          tal_main_source_Sources - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist...source/Sources                                          .gz  Could not open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_.._project_experi                                          mental_contrib_source_Sources - open (30 Read-only file system)
Failed to fetch http://ftp.de.debian.org/debian/dist.../source/Source                                          s.gz  Could not open file /var/lib/apt/lists/partial/ftp.de.debian.org_debian_dists_.._project_exper                                          imental_non-free_source_Sources - open (30 Read-only file system)
W: Not using locking for read only lock file /var/lib/apt/lists/lock
W: Not using locking for read only lock file /var/lib/dpkg/lock
E: Unable to write to /var/cache/apt/
E: The package lists or status file could not be parsed or opened.
The file(s) failed to DL, how do I fix it?