libgcrypt11 is no longer available in the repositories (it uses libgcrypt20 only) and some applications cannot be installed or they don’t run unless libgcrypt11 installed.
Until these third-party application are repackaged to depend on libgcrypt20 instead of libgcrypt11 or they ship with the libgcrypt11.so library so they work properly in Ubuntu 15.04 Vivid Vervet, here’s a quick fix/workaround.
I should mention that this only affects fresh installs of the final Ubuntu 15.04 release. I installed Ubuntu 15.04 while it was still in alpha and back then, libgcrypt11 was already available (and it’s still installed today) so I didn’t notice the issue until it was reported by a few WebUpd8 readers (thanks to Ian Watters, Patrick and Lulzim for the comments regarding this!).
To be able to use Spotify, Brackets and other apps that require libgcrypt11 in Ubuntu 15.04, all you have to do is install libgcrypt11 from an older Ubuntu version, such as Ubuntu 14.04 LTS:
download above library and install. After that install other dependent applications.
Or grab libgcrypt11 debs for any architecture from HERE.
Important: on 64bit, you may also need to install the 32bit package if the app that requires libgcrypt11 uses a multiarch package.