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In Ubuntu 15.04 Vivid Vervet (any flavor, be it Xubuntu, Ubuntu MATE, Kubuntu, etc.), libgcrypt11 is no longer available in the repositories (it uses libgcrypt20 only) and some applications like Spotify, Brackets and others cannot be installed or they don't run unless libgcrypt11 installed:
$ spotify
spotify: error while loading shared libraries: libgcrypt.so.11: cannot open shared object file: No such file or directory
$ sudo dpkg -i Brackets.1.2.Extract.64-bit.deb
dpkg: dependency problems prevent configuration of brackets:
 brackets depends on libgcrypt11 (>= 1.4.5); however:
  Package libgcrypt11 is not installed.

dpkg: error processing package brackets (--install):
 dependency problems - leaving unconfigured
Processing triggers for hicolor-icon-theme (0.14-0ubuntu1) ...
Errors were encountered while processing:

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:

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.

Once installed, Spotify, Brackets, etc. should work under Ubuntu 15.04:

Spotify Ubuntu 15.04
Brackets note: this issue occurs with the official Brackets debs but not with the Brackets version from the WebUpd8 Brackets PPA (I fixed this issue for the PPA packages today).