Try (as root):
You'll then need to look to find what apps you've installed are using up all the rootfs space.

Ok, that worked. Now how do I check which apps are installed where?

ANd how do I prevent this in the future?
THanks, you guys are the best.

StorageUsage can help with that - it can check the installed packages and present a view of their sizes, indicating which are installed on the rootfs. There's the problem of installing it though, if you don't have any free space at all.

You can also use the perl scripts I posted here - they'll generate a list of packages using rootfs, and show which files are in rootfs for an individual package.

Ok, I loaded StorageUsage. Still a little unclear as to where to look and what to delete

Wow, same problems again today. WHy does this keep happening???

Hi, I'm having a similar problem on my N900. I don't have any application catalogues visible and I also can't send /receive messages.
I have 1.6GB free for application installations.
I tried 'apt-get autoclean' but no joy.
I also tried rebooting and removing the battery.

I would really appreciate some suggestions.

Bratac

You have to disable the devel extra's in your app manager.

apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libnss3-certs 20090612-49+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libnss3-certs 20090612-45.0.3+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libnss3-certs 20090612-45.0.1+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: xkbutils 1:1.0.1-0ubuntu1osso4
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_chinook_free_binary-armel_Packages
apt-worker: Ignoring version from wrong domain: libhildon-thumbnail0 3.0.51+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libhildon-thumbnail0 3.0.50+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libhildon-thumbnail0 3.0.44+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libhildon-thumbnail0 3.0.43+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libhildon-thumbnail0 3.0.41+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libhildon-thumbnail0 0.14
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_chinook_free_binary-armel_Packages
apt-worker: Ignoring version from wrong domain: ke-recv 3.19-13+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: ke-recv 3.19-11+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: osso-af-utils 2.12-1+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: osso-af-utils 2.11-1+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: udhcpc 0.9.8cvs20050303-2osso7
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_tools_free_bi nary-armel_Packages
apt-worker: Ignoring version from wrong domain: libgtk2.0-0 2:2.14.7-1maemo33+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libgtk2.0-0 2:2.14.7-1maemo31+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libgtk2.0-0 2:2.14.7-1maemo29+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libgtk2.0-0 2:2.14.7-1maemo21+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libgtk2.0-0 2:2.14.7-1maemo12.2+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libgtk2.0-0 2:2.14.7-1maemo12+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libgtk2.0-0 2:2.14.7-1maemo11+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libsofia-sip-ua0 1.12.10-0maemo5+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libxkbfile1 1:1.0.5-1
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libxkbfile1 1:1.0.4-1osso1
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_chinook_free_binary-armel_Packages
apt-worker: Ignoring version from wrong domain: libopenobex1 1.4-0maemo3+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libopenobex1 1.3osso5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_chinook_free_binary-armel_Packages
apt-worker: Ignoring version from wrong domain: libebook 1.4.2.1-20100623+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libebook 1.4.2.1-20100317.0rtc+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libebook 1.4.2.1-20100226+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libebook 1.4.2.1-20091116+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libebook 1.4.2.1-20090914.1+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: gnupg 1.4.6-2maemo2
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libsdl-image1.2 1.2.4-5-recomp1
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libsdl-image1.2 1.2.4-5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_chinook_free_binary-armel_Packages
apt-worker: Ignoring version from wrong domain: hildon-initscripts 1.26-1+dp1
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: hildon-initscripts 1.26-1+dp1
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_tools_free_bi nary-armel_Packages
apt-worker: Ignoring version from wrong domain: libosso1 2.32-1+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libosso1 2.31-1+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libosso1 2.26-1+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: libosso1 2.23-1+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: busybox 3:1.10.2.legal-1osso30+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages
apt-worker: Ignoring version from wrong domain: busybox 3:1.10.2.legal-1osso26+0m5
apt-worker: /var/lib/apt/lists/repository.maemo.org_dists_fremantle_sdk_free_bina ry-armel_Packages

help! on n800 - doing nothing.