It looks as if for some reason the .lpr of your project omits the Interfaces unit.
Lazarus 1.6.0 gives the same warning in that situation. I don't know how the update can affect it.
Maybe there are mixed .ppu and .o files from the old revision. Just rebuild Lazarus and its packages clean. Usually it solves all problems.
Unfortunately I couldn't pass this warning.
So I tried on a new installation of a debian linux 32bit in the virtualbox.
I installed the 3 of files of .deb of lazarus.
My install order is:
fpc_3.0.0-151205_i386.deb,
fpc-src_3.0.0-151205_i386.deb
lazarus_1.6.2-0_i386.deb
and related packages.
After installation I attempt to run lazarus and lazarus said me debugger is missing. (Attach 1)
I said OK there is no problem for now debugger and I continued but this warning is still giving.
Also last evening I tried on my real computer with Linux Mint is results are same.
And I couldn't rollback to 1.6.0

Edit reason: debugger picture warning and English correction