So with one of the latest upgrades libstdz1 amd64 got updated to 1.4.4 and that got llibzstd1:i386 (1.3.3) uninstalled, which in turn got mesa drivers and a bunch of steam dependencies uninstalled. Ultimately Steam itself was uninstalled. I regretfully use to click OK without reading the messages when updating.

If someone has the same problem I just downgraded amd64 version of libzstd1 with:

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apt install libzstd1=1.3.3+dfsg-2ubuntu1.1

Afterwards I just installed steam again. The dependencies were also subsequently installed without problem and the application started normally too.

i was confused why my steam got removed all of a sudden
this fixed my problem!

Not a Neon issue, the libzstd1 version used is still at the stock Ubuntu 18.04 version and packaging , this update probably is from an external source.

apt policy libzstd1
libzstd1:
Installed: 1.3.3+dfsg-2ubuntu1.1
Candidate: 1.3.3+dfsg-2ubuntu1.1
Version table:
*** 1.3.3+dfsg-2ubuntu1.1 500
500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
1.3.3+dfsg-2ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Package

Never lost my Steam install or anything else here.

claydoh wrote:Not a Neon issue, the libzstd1 version used is still at the stock Ubuntu 18.04 version and packaging , this update probably is from an external source.

could it be coming from ppa? i have this output when i run apt update:

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libzstd1/unknown 1.4.4+dfsg-3~bpo10+1 amd64 [upgradable from: 1.3.3+dfsg-2ubuntu1.1]
snapd/bionic-updates,bionic-security 2.45.1+18.04.2 amd64 [upgradable from: 2.45.1+18.04]

EDIT: it came from the Custom Kernel i'm running. is it possible to blacklist this update?

Installed: 1.3.3+dfsg-2ubuntu1.1
Candidate: 1.4.4+dfsg-3~bpo10+1
Version table:
1.4.4+dfsg-3~bpo10+1 500
500 http://deb.xanmod.org releases/main amd64 Packages
*** 1.3.3+dfsg-2ubuntu1.1 500
500 http://id.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
1.3.3+dfsg-2ubuntu1 500
500 http://id.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

Guilty as charged! I forgot to check the package source. It is indeed an external PPA.

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apt policy libzstd1
[sudo] password for jaime:
libzstd1:
  Installed: 1.3.3+dfsg-2ubuntu1.1
  Candidate: 1.4.4+dfsg-3~bpo10+1
  Version table:
     1.4.4+dfsg-3~bpo10+1 500
        500 http://deb.xanmod.org releases/main amd64 Packages
 *** 1.3.3+dfsg-2ubuntu1.1 500
        500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1.3.3+dfsg-2ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages