When upgrade to Ubuntu 18.04, some libraries are still needed for OpenCV 3.4 and others, but not provided by the new OS. We can install it like this:
sudo add-apt-repository “deb http://security.ubuntu.com/ubuntu xenial-security main”
sudo apt update
sudo apt install libjasper1 libjasper-dev
My research note 
hi it doesn’t work
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Can you show me the error message?
It will not work if you just copy and paste.
Please replace the “” in your system.
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I replaced the double quotations (” “) with single quotations ( ‘ ‘ ) and it worked
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thank you!
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Getting this error:
W: Failed to fetch http://security.ubuntu/ubuntu/dists/xenial-security/InRelease Could not resolve ‘security.ubuntu’
W: Some index files failed to download. They have been ignored, or old ones used instead.
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Please check the URL is correct or not. Maybe something was missing, like ‘.com’ after ‘security.ubuntu’
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For those complain about the link doesn’t work, you shall change the symbols of ” to “, they looked different and the latter symbol works for me.
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I have been fighting this for a week and this does not work. I have tried everything in the comments and this just does not work. This is the error I always get:
Reading package lists… Done
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/main/binary-arm64/Packages 404 Not Found [IP: 91.189.88.173 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
so when I try to install the libjasper, it can’t be found.
I am trying to install this on a Jetson Nano running Ubuntu 18.04. What am I doing wrong?
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Are you sure that you replace the double quotations (” “) with proper ones in your system?
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Hi,
I face exactly the same problem. Also on Jetson Nano.
I’ve already tried replacing quotations to ” ” or ‘ ‘ but still it doesn’t work…
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The problem should be from Jetson Nano Ubuntu system. But I saw some post said that libjasper is not really required for OpenCV.
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