According to this information:
Playonlinux has been removed from Ubuntu 17.04 repositories. If you do a search in Synaptic (and have not added a playonlinux repository) using "playonlinux" it returns no results, and because of this, I assume it is correct that it is not in the repositories.
I installed by running in terminal:
sudo add-apt-repository ppa:noobslab/apps
sudo apt-get update
sudo apt-get install playonlinux
This installed playonlinux. However, none of my programs (which had previously run with Mate 16.4) would run. I then installed:
wine32-preloader:i386
wine64-preloader
The three programs you mentioned:
libwine:i386 (1.8.7-1ubuntu1 Ubuntu:17.04/zesty [i386])
wine32:i386 (1.8.7-1ubuntu1 Ubuntu:17.04/zesty [i386])
wine-stable (1.8.7-1ubuntu1 Ubuntu:17.04/zesty [all])
are all installed. At this point, two of the three windows programs I'm trying to run will work. When I run the third program in debug, I get the following results:
[05/17/17 19:16:22] - Running wine-1.8.6 Journal6.exe (Working directory : /home/jim/.PlayOnLinux/wineprefix/WindowsXP/drive_c/Program Files/DavidRM Software/The Journal 6)
fixme:thread:GetThreadUILanguage : stub, returning default language.
fixme:nls:GetThreadPreferredUILanguages 00000038, 0x32d8f4, (nil) 0x32d91c
fixme:nls:get_dummy_preferred_ui_language (0x38 0x32d8f4 (nil) 0x32d91c) returning a dummy value (current locale)
fixme:nls:GetThreadPreferredUILanguages 00000038, 0x32d8f4, 0x1faa680 0x32d91c
fixme:nls:get_dummy_preferred_ui_language (0x38 0x32d8f4 0x1faa680 0x32d91c) returning a dummy value (current locale)
fixme:wtsapi:WTSRegisterSessionNotification Stub 0x10074 0x00000000
fixme:uxtheme:BufferedPaintInit Stub ()
fixme:system:SetProcessDPIAware stub!
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: cannot open shared object file: No such file or directory
fixme:dwmapi:DwmIsCompositionEnabled 0x32ea8c
err:wincodecs:PngDecoder_CreateInstance Failed reading PNG because unable to find libpng12.so.0
wine: Unhandled exception 0x0eedfade in thread 9 at address 0x2c4ad296:0x7b83ec42 (thread 0009), starting debugger...
err:seh:setup_exception_record stack overflow 944 bytes in thread 0009 eip 7bc82cb0 esp 00230f80 stack 0x230000-0x231000-0x330000
Process of pid=0008 has terminated
No process loaded, cannot execute 'echo Modules:'
Cannot get info on module while no process is loaded
No process loaded, cannot execute 'echo Threads:'
process tid prio (all id:s are in hex)
0000000e services.exe
0000001e 0
0000001d 0
00000017 0
00000016 0
00000014 0
00000010 0
0000000f 0
00000012 winedevice.exe
0000001c 0
00000019 0
00000018 0
00000013 0
0000001a plugplay.exe
00000020 0
0000001f 0
0000001b 0
00000021 explorer.exe
00000025 0
00000024 0
00000023 0
00000022 0
winedbg: Internal crash at 0x7eb606d9
It would seem to me that this is some dependency problem, and since I don't have wine:i386 installed, it seemed that that might be the first thing I should try. I don't know. Maybe when playonlinux solves this sha256sum problem, that will take care of it.