Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
 Librepo error: Cannot download toplink/packages/pcp/6.3.2/5.fc42/x86_64/pcp-pmda-dbping-6.3.2-5.fc42.x86_64.rpm: All mirrors were tried
DNF failed to download a package