Somewhere online I saw a recommendation to try the Blueman manager, which I've downloaded but it hasn't solved my problem.
I can confirm the speaker's Bluetooth adapter works because I've used it successfully with an Android and an iPhone.
Here is inxi -Fxz with my system details:
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System: Host: Inspiron7000 Kernel: 4.4.0-59-generic x86_64 (64 bit gcc: 5.4.0) Desktop: Xfce 4.12.3 (Gtk 2.24.28) Distro: Linux Mint 18 Sarah Machine: System: Dell (portable) product: Inspiron 13-7359 Mobo: Dell model: 0WJF7F v: A00 Bios: Dell v: 01.06.00 date: 02/25/2016 CPU: Dual core Intel Core i7-6500U (-HT-MCP-) cache: 4096 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 10367 clock speeds: max: 3100 MHz 1: 604 MHz 2: 888 MHz 3: 886 MHz 4: 624 MHz Graphics: Card: Intel Sky Lake Integrated Graphics bus-ID: 00:02.0 Display Server: X.Org 1.18.3 drivers: intel (unloaded: fbdev,vesa) Resolution: firstname.lastname@example.org GLX Renderer: Mesa DRI Intel HD Graphics 520 (Skylake GT2) GLX Version: 3.0 Mesa 11.2.0 Direct Rendering: Yes Audio: Card Intel Sunrise Point-LP HD Audio driver: snd_hda_intel bus-ID: 00:1f.3 Sound: Advanced Linux Sound Architecture v: k4.4.0-59-generic Network: Card: Intel Wireless 3165 driver: iwlwifi bus-ID: 01:00.0 IF: wlp1s0 state: up mac: <filter> Drives: HDD Total Size: 256.1GB (28.1% used) ID-1: /dev/sda model: SanDisk_Z400s_2. size: 256.1GB Partition: ID-1: / size: 226G used: 60G (28%) fs: ext4 dev: /dev/dm-1 ID-2: /boot size: 473M used: 165M (37%) fs: ext2 dev: /dev/sda2 ID-3: swap-1 size: 8.43GB used: 0.00GB (0%) fs: swap dev: /dev/dm-2 RAID: No RAID devices: /proc/mdstat, md_mod kernel module present Sensors: System Temperatures: cpu: 32.0C mobo: 25.0C Fan Speeds (in rpm): cpu: N/A Info: Processes: 223 Uptime: 18 min Memory: 855.8/7837.7MB Init: systemd runlevel: 5 Gcc sys: 5.4.0 Client: Shell (bash 4.3.421) inxi: 2.2.35
EDIT: Previously I had poked around in the pulseaudio settings to set the speaker as an A2DP device. I just opened the settings again and I'm now getting a message "Establishing connection to PulseAudio. Please wait". Nothing happens afterward. I am positive this is not the source of my bluetooth problem, because I could see the settings there before. But now it looks like I've got two problems. Should I be re-installing pulseaudio?