Problem

If one library folder is out of space downloading a game return

You do not have enough disk space available to run this game. Pleas free up some disk space and then try again.

Steam Library Folders

folder                          installed   used space  free space
/home/user/.local/share/Steam   0           0 bytes     4.19 GB
/mnt/hgfs/shared/e/steam        0           0 bytes     163.87 GB

Discussion

• Attempting remove of /home/user/.local/share/Steam return

The default Steam install folder can't be removed

• Using a folder link instead doesn't alter the disk space check and therefore doesn't work around this restriction

s=~/.local/share/Steam/SteamApps; rm -rf $s; ln -s /mnt/hgfs/shared/e/steam $s

• How do I alter the disk space reported to the client?

Workaround

killall steam
mv ~/.local/share/Steam ~/.local/share/Steam.old
steam   # select default library folder

Suggestions

• Allow saving only game files to a separate location (rather than to ./SteamApps) because
  • the user can backup program settings by other means
  • the path selection is primarily of interest for saving the game files because they're large
• If a library path is out of space, download to the library path(s) with space (instead of halting the download)