Installing varnish on Debian 10 (Buster) - varnish

It seems that varnish 6.1.1 offered by Debian repo is marked as 'security' and fix is only available on varnish version ^6.2.1
so I looked around and landed here https://packagecloud.io/varnishcache/varnish62/install
Where I can only find packages for Debian Stretch Bionic or Xenial.
There doesn't seem to be a source package either.
Is there a reason for https://packagecloud.io/varnishcache/ not to have any packages for the Debian Buster ? Not even the 6.1 ?
What should I do?
thanks

this is an ongoing project, weeklies for buster will land next week if all goes well, then 60lts and 63 will get them.
Note that the project have multiple ways for you to contact them and ask about this, stackoverflow is definitely not the best channel for such specific inquiries.

https://packagecloud.io/varnishcache/varnish64/install shows this script:
# curl -s https://packagecloud.io/install/repositories/varnishcache/varnish64/script.deb.sh |bash
and then
# apt-get install varnish

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This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
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I'm using rhel 7 how can I solve this?
Please download the rpm of repository for CENTOS 7 and RHEL 7
RHEL/CentOS 7 64-Bit
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You must realize that RHEL operating system is not FOSS (free and open-source) like CentOS or Ubuntu. You need to purchase a subscription to use its services like software repository and tech support.
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How should I install packages that generally are available in Ubuntu repos on Debian

I have Linux Mint in my home computer and I'm about to install Debian Jessie in my work computer. I have dealt with Debian before and many packages that are available in Ubuntu repositories by default aren't available for Debian. As someone who needs all those packages I was wondering what would be the correct way of installing them on Debian.
The first thought that came to me was adding Ubuntu sources to sources.list, but I read some things and apparently people do not recommend this.
Since I have to install many of these packages, I also would like to avoid having to install them from source one-by-one.
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Thank you.
I'm don't think you can install them from the repos if you don't want to add sources in sources.list.
If we are talking about reasonably small number of packages (say 10) I would recommend checking if .deb packages exist on the home pages.
For example:
http://pkgs.org/download/ipython
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Updating Ubuntu 11.04 to 12.04 preferrably through command line

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or
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I search a lot about this problem, but all the solutions I found did not solve my problem.
I installed Linux Mint 17 with mate desktop in a virtual machine. After the installation, I wanted to update the packages but after running
apt-get update
I get the following error:
E: GPG error: http://archive.ubuntu.com trusty Release: The following signatures were invalid: NODATA 2
The solutions I found in https://askubuntu.com/questions/104213/gpg-invalid-signature did not solve it.
I think the problem is that the computer is behind a proxy. I tried all the different proxy settings, but the error still exists.
Thanks
I found the solution myself :)
first you have to comment out the repositories, that are not working (trusty-main, trusty-updates and trusty-security)
then you can update the remaining packages
After that you have to find a mirror that is working for the above repositories (the german gwdg server worked for me)
After you added the corresponding repositories, you can update the remaining programs.
apparently it is important to first update the other packages before you update the ones from the above repositories.

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