Works for me, using Ubuntu 18.04 Bionic Beaver kernels 4.15.0-30 and some older versions.
Because I don't have a real certificate installed on my ASA, just self-signed, it'll clunk around the first couple of times asking if you're really really sure you trust it because it's only self-signed, and it'll want to install itself on your desktop (I haven't yet tried connecting to an older ASA - I ran this using ASA 9.10 beta and corresponding ASDM 7.10 but it's supposed to be backward compatible.)
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ftp://ftp.cisco.com/pub/mibs/supportlists/asa/asa-supportlist.html looks like the current location for the ASA MIBs, up through ASA 8.4 - I haven't found a newer one yet (there's a newer http URL that's 404.)
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