Executing: apt-get update
Get:1 http://deb.debian.org/debian forky InRelease [137 kB]
Get:2 http://deb.debian.org/debian forky/main armhf Packages [9274 kB]
Get:3 http://deb.debian.org/debian forky/main Translation-en [6451 kB]
Fetched 15.9 MB in 4s (3780 kB/s)
Reading package lists...
Execution completed (exit code 0)
Executing: apt-get --yes install piuparts
Reading package lists...
Building dependency tree...
Reading state information...
Package piuparts is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'piuparts' has no installation candidate