your mirror is out of date or something..
apt install libosmesa6
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
libosmesa6
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 1280 kB of archives.
After this operation, 4334 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libosmesa6
amd64 18.0.5-0ubuntu0~18.04.1 [1280 kB]
Fetched 1280 kB in 1s (1745 kB/s)
Selecting previously unselected package libosmesa6:amd64.
(Reading database ... 48125 files and directories currently installed.)
Preparing to unpack .../libosmesa6_18.0.5-0ubuntu0~18.04.1_amd64.deb ...
Unpacking libosmesa6:amd64 (18.0.5-0ubuntu0~18.04.1) ...
Setting up libosmesa6:amd64 (18.0.5-0ubuntu0~18.04.1) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
** Changed in: mesa (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1800359
Title:
libosmesa6 is not installable in 18.04
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https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1800359/+subscriptions
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