Do this.
Use the Puppy Package Manager(PPM) to install what it finds for util-linux.
first run PPM -> Configure -> Data base update to make sure the repository info is updated.
Do a search for util-linux
It will tell you that it found util-linux_2.31.1 and it is already installed.
Install it anyway.
Just select it and install, selecting do it.
After doing this install of util-linux it should now have fstrim.
Puppy has a GUI program to run trim
viewtopic.php?t=4907
This worked for my install of Bionicpup64 8.0
If you have not already done it.
Bionicpup64 8.0 has some updates to fix a few bugs and provide some newer versions of software.
Quickpet -> Info -> Bionicpup updates
Reboot updating the save
So now the new changes are being used.
Note:
Sometimes a Puppy developer will only put parts of software packages in the build.
This does make PPM show it already installed.
If you tell PPM to install it anyway.
That will usually get the complete software package installed.
If during install process, it errors with a message it is already installed.
Than it did actually have the complete software package installed.