This question already has an answer here:

I tried to install crossover and after downloading the .deb from their website, I followed the steps as indicated when opening it with Ubuntu Software Centre:

On 64-bit flavors of Debian and some Ubuntu variants, first open a terminal and run sudo dpkg --add-architecture i386 ; sudo apt-get update

Since I have Ubuntu 16.04 LTS 64 bit I perform the command.

But when copying and pasting that command into my terminal, it stopped at Fetched 535kb in 7sec and stalled there for about 20 minutes. I ended up closing it and tried to run both commands separately but after doing the sudo apt-get update command it also stalls again after "Fetched XXKb in XXsec."

I restarted my computer and decided to run the software updater and it stays stuck at roughly 75% for hours.

marked as duplicate by Braiam, jokerdino May 21 '16 at 10:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Try setting your DNS servers to and That fixed it for me when I had this problem. – Android Dev May 19 '16 at 23:16
  • 2
    I am currently having similar issues and it seems to be related to this thread on the Ubuntu Forums where appstreamcli refresh is pegged at 100% in the processes tab and will completely max one of my cores when the update command is running which leads me to believe that this may be a bug in appstreamcli. – Michael Lindman May 20 '16 at 0:01
  • I looked at my CPU resources and core 7 is at 100% where as the other 7 are normal at like 1-2%. Thanks for the help! – Steve May 20 '16 at 0:21
  • 1
    I can confirm the issue here, with appstreamcli taking 100% cpu. Killing it just makes apt-get fail immediately. – isanae May 20 '16 at 0:55

This is a known bug and has been fixed. From a comment in the bug tracker, installing the following packages manually solves the problem, at least for me (the URLs are for amd64, adjust URLs for other architectures):

cd /tmp && mkdir asfix
cd asfix
sudo dpkg -i *.deb
cd ..
rm -r asfix
  • I am on Ubuntu 16.04 with an ARM processor and this didn't work for me. I replaced amd64 with arm64, everything ok. I was able to fetch the files but then when I run sudo apt-get update I am always stuck – kalmanIsAGameChanger Apr 19 at 12:42

The bug has been fixed. The packages can be downloaded and installed by opening a terminal (press Ctrl+Alt+T) and running the following three commands:

sudo dpkg -i libappstream3_0.9.4-1ubuntu1_amd64.deb gir1.2-appstream_0.9.4-1ubuntu1_amd64.deb appstream-index_0.9.4-1ubuntu1_all.deb appstream_0.9.4-1ubuntu1_amd64.deb
sudo apt update

I ran into a similar issue (stuck apt update on 16.04, 2x apistreamcli at 100%), however that was not related to any particular installation.

For me it was enough to kill -sigterm the stuck apistreamcli-processes. After that apt update && apt upgrade worked again without issues.

protected by Community May 21 '16 at 9:19

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

Would you like to answer one of these unanswered questions instead?

Not the answer you're looking for? Browse other questions tagged or ask your own question.