Trying to upgrade 14.03 to 14.04 - I get: The following extra files have been found * .rnd

[kesselb]

Integrity check failed core -> extra file -> .rnd

It is a “feature” of OpenSSL to collect entropy/randomness if required for cryptography tasks, so for any certificate or key generation, encrypted network connection and such. However I never found one on my systems, no sure in which case these are used. Actually there are kernel files that provide entropy /dev/random and /dev/urandom. Probably OpenSSL (or the software that use its libs) create those files if the regular entropy pool is empty or if they don’t have permissions to access, not sure…

Here is a more detailed explanation about these files. Starting with Nextcloud 17 these files are ignored from integrity check and updater.

Exclude .rnd files from integrity check

Exclude .rnd files