Comment 18 for bug 1680224

I've retested this with autofs 5.1.5 (eoan), and @ahasenack's suggested change to auto.smb is definitely required. With the $ escaped, mount fails as it's given a literal \$ in the path.

For older versions of autofs, the following workaround works (tested with autofs 5.1.2 on bionic):
/etc/default/autofs:
# Use OPTIONS to add automount(8) command line options that
# will be used when the daemon is started.
#
OPTIONS="-Ddollar='$'"

/etc/auto.smb:
@@ -76,7 +76,7 @@
     loc = $2
     # Enclose mount dir and location in quotes
     # Double quote "$" in location as it is special
- gsub(/\$$/, "\\$", loc);
+ gsub(/\$$/, "$dollar", loc);
     gsub(/\&/,"\\\\&",loc)
     print " \\\n\t \"/" dir "\"", "\"://" key "/" loc "\""
   }