The desktop computer as described in the inxi output below has Cinnamon running in software rendering mode. The driver manager is not offering anything. I'm not sure what to do next. I'd appreciate pointers. Thanks!
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moem@pjoeter:~$ inxi -Fxz
System: Host: Pjoeter Kernel: 4.15.0-38-generic x86_64
bits: 64 gcc: 7.3.0
Desktop: Cinnamon 3.8.9 (Gtk 3.22.30-1ubuntu1)
Distro: Linux Mint 19 Tara
Machine: Device: desktop Mobo: Gigabyte model: M55S-S3 serial: N/A
BIOS: Award v: FI date: 03/07/2008
CPU: Dual core AMD Athlon 64 X2 4400+ (-MCP-)
arch: K8 rev.F+ cache: 1024 KB
flags: (lm nx sse sse2 sse3 svm) bmips: 8040
clock speeds: max: 2300 MHz 1: 2000 MHz 2: 2000 MHz
Graphics: Card: Matrox Systems Millenium P650 PCIe bus-ID: 02:00.0
Display Server: x11 (X.Org 1.19.6 )
drivers: fbdev (unloaded: modesetting,vesa)
Resolution: 1280x1024@77.00hz
OpenGL: renderer: llvmpipe (LLVM 6.0, 128 bits)
version: 3.3 Mesa 18.0.5 Direct Render: Yes
Audio: Card NVIDIA MCP55 High Def. Audio
driver: snd_hda_intel bus-ID: 00:06.1
Sound: Advanced Linux Sound Architecture v: k4.15.0-38-generic
Network: Card: NVIDIA MCP55 Ethernet
driver: forcedeth port: e400 bus-ID: 00:08.0
IF: enp0s8 state: up speed: 1000 Mbps duplex: full mac: <filter>
Drives: HDD Total Size: 720.2GB (3.0% used)
ID-1: /dev/sda model: Hitachi_HDS72168 size: 80.0GB
ID-2: /dev/sdb model: Hitachi_HDT72503 size: 320.1GB
ID-3: /dev/sdc model: Hitachi_HDT72503 size: 320.1GB
Partition: ID-1: / size: 30G used: 14G (46%) fs: ext4 dev: /dev/sda1
ID-2: /home size: 36G used: 141M (1%) fs: ext4 dev: /dev/sda5
ID-3: swap-1 size: 8.19GB used: 0.00GB (0%)
fs: swap dev: /dev/sda2
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 58.0C mobo: N/A
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 168 Uptime: 15 min Memory: 622.1/3945.4MB
Init: systemd runlevel: 5 Gcc sys: 7.3.0
Client: Shell (bash 4.4.191) inxi: 2.3.56