yadedaily PPA problem?
See this launchpad question, the user cannot install on Xenial without reaching the error below. I confirm the same issue on bionic:
E: Failed to fetch http://www.yade-dem.org/packages/bionic/Packages.bz2 File has unexpected size (2213 != 2211). Mirror sync in progress? [IP: 194.254.65.201 80] Hashes of expected file: - Filesize:2211 [weak] - SHA256:6632b05ef800e299cfe0b87cdde7e2142d0b90921dbb337e292217f8300018c1 - SHA1:d551a42a9c48bc96ca7474980c4d971d1381e7b8 [weak] - MD5Sum:db6b617f52aecf8bc6e1e173e45257bf [weak] Release file created at: Tue, 16 Apr 2019 07:26:22 +0000 E: Some index files failed to download. They have been ignored, or old ones used instead.
A quick google search for this File has unexpected size
error says there may be something wrong with our server.
I am fairly certain this has nothing to do with #58 (closed), since the issue here is not that the PPA is not updated but that it is no longer accessible.