The seem to be multiple version live, see
# apt list --upgradeable
Listing... Done
clamav-daemon/xenial-updates 0.99+dfsg-1ubuntu1.2 amd64 [upgradable from: 0.99+dfsg-1ubuntu1.1]
N: There are 2 additional versions. Please use the '-a' switch to see them.
# apt list --upgradable -a
Listing... Done
clamav-daemon/xenial-updates 0.99+dfsg-1ubuntu1.2 amd64 [upgradable from: 0.99+dfsg-1ubuntu1.1]
clamav-daemon/now 0.99+dfsg-1ubuntu1.1 amd64 [installed,upgradable to: 0.99+dfsg-1ubuntu1.2]
clamav-daemon/xenial 0.99+dfsg-1ubuntu1 amd64
The seem to be multiple version live, see daemon/ xenial- updates 0.99+dfsg- 1ubuntu1. 2 amd64 [upgradable from: 0.99+dfsg- 1ubuntu1. 1] daemon/ xenial- updates 0.99+dfsg- 1ubuntu1. 2 amd64 [upgradable from: 0.99+dfsg- 1ubuntu1. 1] 1ubuntu1. 1 amd64 [installed, upgradable to: 0.99+dfsg- 1ubuntu1. 2] daemon/ xenial 0.99+dfsg-1ubuntu1 amd64
# apt list --upgradeable
Listing... Done
clamav-
N: There are 2 additional versions. Please use the '-a' switch to see them.
# apt list --upgradable -a
Listing... Done
clamav-
clamav-daemon/now 0.99+dfsg-
clamav-