What my problem is
I can't install updates or any new package from ubuntu repositories. The package list seems to only contain already installed packages, e.g.
$ apt-cache policy bash bash: Installed: 5.0-4ubuntu1 Candidate: 5.0-4ubuntu1 Version table: *** 5.0-4ubuntu1 100 100 /var/lib/dpkg/status $ apt search curl Sorting... Done Full Text Search... Done curl/now 7.65.3-1ubuntu3 arm64 [installed,local] command line tool for transferring data with URL syntax libcurl3-gnutls/now 7.65.3-1ubuntu3 arm64 [installed,local] easy-to-use client-side URL transfer library (GnuTLS flavour) libcurl4/now 7.65.3-1ubuntu3 arm64 [installed,local] easy-to-use client-side URL transfer library (OpenSSL flavour)
apt-cache policy to display a line like
500 http://ports.ubuntu.com/ubuntu-ports eoan/main arm64 Packages
like on any other ubuntu. The
apt search command should have output a long list of packages.
What I did before this happened
I downloaded the preinstalled 19.10 image today from http://cdimage.ubuntu.com/releases/eoan/release/ubuntu-19.10-preinstalled-server-arm64+raspi3.img.xz and
dded it on a SD card and booted a raspberry pi 4b from it. The device boots fine. I then wanted to do a
dist-upgrade as I normally do after installing an ubuntu system from some image.
apt update seems to have run without any serious issue:
$ sudo apt update Hit:1 http://ports.ubuntu.com/ubuntu-ports eoan InRelease Hit:2 http://ports.ubuntu.com/ubuntu-ports eoan-updates InRelease Hit:3 http://ports.ubuntu.com/ubuntu-ports eoan-backports InRelease Hit:4 http://ports.ubuntu.com/ubuntu-ports eoan-security InRelease WARNING:root:cannot read /var/lib/command-not-found/commands.db.metadata: Expecting value: line 1 column 1 (char 0) Reading package lists... Done Building dependency tree Reading state information... Done All packages are up to date.
That warning seemed a bit strange, but went away when running
apt update again.
Immediately after that I ran
$ sudo apt upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
That was the first indication that something was strange as normally those images are not completely up to date.
What I tried to solve this
I tried these commands a couple times, rebooted the system after doing a couple other changes (setting hostname, adding kernel parameters to bootloader). Still no packages.
I then added another repository to apt which works completely fine. I can find packages in it and install them. No problem at all.
But trying to install the packages
docker.io, those could not be found.
I looked for the package list files in
/var/cache/apt/list but could not find that directory. On a working 18.04 armhf system that directory is missing, too, so this seems to be ok. There is instead a file
/var/cache/apt/pkgcache.bin which I tried to remove (
sudo rm /var/cache/apt/pkgcache.bin), but after
apt update the problem remains.
Further useful information
/etc/apt/sources.list (comments removed for brevity):
deb http://ports.ubuntu.com/ubuntu-ports eoan main restricted deb http://ports.ubuntu.com/ubuntu-ports eoan-updates main restricted deb http://ports.ubuntu.com/ubuntu-ports eoan universe deb http://ports.ubuntu.com/ubuntu-ports eoan-updates universe deb http://ports.ubuntu.com/ubuntu-ports eoan multiverse deb http://ports.ubuntu.com/ubuntu-ports eoan-updates multiverse deb http://ports.ubuntu.com/ubuntu-ports eoan-backports main restricted universe multiverse deb http://ports.ubuntu.com/ubuntu-ports eoan-security main restricted deb http://ports.ubuntu.com/ubuntu-ports eoan-security universe deb http://ports.ubuntu.com/ubuntu-ports eoan-security multiverse
/etc/apt/sources.list.d is empty. It is the original file from the image, I didn't modify it.
I am at a loss here, out of ideas how to debug this further. Does anyone of you have an idea what went wrong on that system?