Uma instalação bem-sucedida de um pacote (como wget ) conterá referências ao pacote em setup.log .
Por exemplo:
$ grep wget setup.log
2015/06/10 11:11:14 Downloaded F:\downloads\cygwin/ftp%3a%2f%2fftp.mirrorservice.org%2fsites%2fsourceware.org%2fpub%2fcygwin%2f/x86_64/release/pwget/pwget-2013.0911+gitaf1c897-2.tar.bz2
2015/06/10 11:11:25 Downloaded F:\downloads\cygwin/ftp%3a%2f%2fftp.mirrorservice.org%2fsites%2fsourceware.org%2fpub%2fcygwin%2f/x86_64/release/wget/wget-1.16.3-1.tar.xz
2015/06/10 11:12:00 Extracting from file://F:\downloads\cygwin/ftp%3a%2f%2fftp.mirrorservice.org%2fsites%2fsourceware.org%2fpub%2fcygwin%2f/x86_64/release/pwget/pwget-2013.0911+gitaf1c897-2.tar.bz2
2015/06/10 11:12:03 Extracting from file://F:\downloads\cygwin/ftp%3a%2f%2fftp.mirrorservice.org%2fsites%2fsourceware.org%2fpub%2fcygwin%2f/x86_64/release/wget/wget-1.16.3-1.tar.xz
2015/06/10 11:15:59 running: C:\cygwin\bin\bash.exe --norc --noprofile "/etc/postinstall/wget.sh"
Fonte Faq do Cygwin
2.15. What if setup fails? First, make sure that you are using the latest version of Cygwin Setup. The latest version is always
available from the Cygwin Home Page at https://cygwin.com/.
If you are downloading from the Internet, setup will fail if it cannot
download the list of mirrors at https://cygwin.com/mirrors.html. It
could be that the network is too busy. Something similar could be the
cause of a download site not working. Try another mirror, or try again
later.
If setup refuses to download a package that you know needs to be
upgraded, try deleting that package's entry from /etc/setup. If you
are reacting quickly to an announcement on the mailing list, it could
be that the mirror you are using doesn't have the latest copy yet. Try
another mirror, or try again tomorrow.
If setup has otherwise behaved strangely, check the files setup.log and setup.log.full in /var/log (C:\cygwin\var\log by default). It may
provide some clues as to what went wrong and why.
If you're still baffled, search the Cygwin mailing list for clues.
Others may have the same problem, and a solution may be posted there.
If that search proves fruitless, send a query to the Cygwin mailing
list. You must provide complete details in your query: version of
setup, options you selected, contents of setup.log and setup.log.full,
what happened that wasn't supposed to happen, etc.
