As of today, July 18, 2019, Ubuntu Studio 18.10 has reached the end of its support cycle.
We strongly urge all users of 18.10 to upgrade to Ubuntu Studio 19.04 for support through January 2020 and then after the release of Ubuntu Studio 19.10, codenamed Eoan Ermine, in October 2019 which will also be supported for 9 months.
Ubuntu Studio 18.10 will no longer receive any support from this point forward. Packages will not be updated any further, and packages in the Ubuntu Studio Backports PPA for 18.10 will be removed if they haven’t been already. Additionally, if you have added the backports PPA, it is highly recommended that you remove the PPA prior to upgrading using the instructions in this link.