Why there are duplicate executables with different version in /usr/bin and /usr/local/bin?

Question

Why there are duplicate executables with different version in /usr/bin and /usr/local/bin?

Answer

These packages there are duplicated versions of binaries came from Plesk installation. Some packages on Plesk include their own binaries like Python and the same behavior happens with SpamAssassin:

# apt list --installed|grep assassin
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
psa-spamassassin/now 18.0-v.debian.12+p18.0.69.1+t250416.1646 amd64 [installed,local]
spamassassin/now 4.0.1-1~deb12u1 all [installed,local]

This is an expected behavior, see the same command on a test server running Ubuntu 22:

# apt list --installed |grep assassin
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
psa-spamassassin/now 18.0-v.ubuntu.22.04+p18.0.69.0+t250319.1223 amd64 [installed,local]
spamassassin/jammy-updates,jammy-updates,now 3.4.6-1ubuntu0.22.04.1 all [installed]