Use to work; now it don't. Un-installed, re-installed, checked forum for solutions. 4GB RAM, 300GB disk space.
$ obs
Attempted path: share/obs/obs-studio/locale/en-US.ini
Attempted path: /usr/share/obs/obs-studio/locale/en-US.ini
Attempted path: share/obs/obs-studio/locale.ini
Attempted path: /usr/share/obs/obs-studio/locale.ini
Attempted path: share/obs/obs-studio/themes/System.qss
Attempted path: /usr/share/obs/obs-studio/themes/System.qss
info: CPU Name: Intel(R) Core(TM) i3-2330M CPU @ 2.20GHz
info: CPU Speed: 802.671MHz
info: Physical Cores: 2, Logical Cores: 4
info: Physical Memory: 3723MB Total, 604MB Free
info: Kernel Version: Linux 4.19.0-24-amd64
info: Distribution: "Debian GNU/Linux" "10"
info: Window System: X11.0, Vendor: The X.Org Foundation, Version: 1.20.4
info: Portable mode: false
Attempted path: share/obs/obs-studio/themes/Dark/no_sources.svg
Attempted path: /usr/share/obs/obs-studio/themes/Dark/no_sources.svg
QMetaObject::connectSlotsByName: No matching signal for on_advAudioProps_clicked()
QMetaObject::connectSlotsByName: No matching signal for on_advAudioProps_destroyed()
QMetaObject::connectSlotsByName: No matching signal for on_actionGridMode_triggered()
QMetaObject::connectSlotsByName: No matching signal for on_program_customContextMenuRequested(QPoint)
info: OBS 25.0.8+dfsg1-0.1~mx19+1 (linux)
info: ---------------------------------
info: ---------------------------------
info: audio settings reset:
samples per sec: 44100
speakers: 2
info: ---------------------------------
info: Initializing OpenGL...
info: Loading up OpenGL on adapter Intel Open Source Technology Center Mesa DRI Intel(R) Sandybridge Mobile
info: OpenGL loaded successfully, version 3.3 (Core Profile) Mesa 18.3.6, shading language 3.30
info: ---------------------------------
info: video settings reset:
base resolution: 1024x768
output resolution: 680x512
downscale filter: Bicubic
fps: 30/1
format: RGBA
YUV mode: None
info: GPU conversion not available for format: 6
info: NV12 texture support not available
info: Audio monitoring device:
name: Default
id: default
info: ---------------------------------
warning: Failed to load 'en-US' text for module: 'decklink-ouput-ui.so'
libDeckLinkAPI.so: cannot open shared object file: No such file or directory
warning: A DeckLink iterator could not be created. The DeckLink drivers may not be installed
info: No blackmagic support
info: FFMPEG VAAPI supported
info: VLC found, VLC video source enabled
info: [Source Switcher] loaded version 0.4.1
*** buffer overflow detected ***: obs terminated
Aborted
$ obs
Attempted path: share/obs/obs-studio/locale/en-US.ini
Attempted path: /usr/share/obs/obs-studio/locale/en-US.ini
Attempted path: share/obs/obs-studio/locale.ini
Attempted path: /usr/share/obs/obs-studio/locale.ini
Attempted path: share/obs/obs-studio/themes/System.qss
Attempted path: /usr/share/obs/obs-studio/themes/System.qss
info: CPU Name: Intel(R) Core(TM) i3-2330M CPU @ 2.20GHz
info: CPU Speed: 802.671MHz
info: Physical Cores: 2, Logical Cores: 4
info: Physical Memory: 3723MB Total, 604MB Free
info: Kernel Version: Linux 4.19.0-24-amd64
info: Distribution: "Debian GNU/Linux" "10"
info: Window System: X11.0, Vendor: The X.Org Foundation, Version: 1.20.4
info: Portable mode: false
Attempted path: share/obs/obs-studio/themes/Dark/no_sources.svg
Attempted path: /usr/share/obs/obs-studio/themes/Dark/no_sources.svg
QMetaObject::connectSlotsByName: No matching signal for on_advAudioProps_clicked()
QMetaObject::connectSlotsByName: No matching signal for on_advAudioProps_destroyed()
QMetaObject::connectSlotsByName: No matching signal for on_actionGridMode_triggered()
QMetaObject::connectSlotsByName: No matching signal for on_program_customContextMenuRequested(QPoint)
info: OBS 25.0.8+dfsg1-0.1~mx19+1 (linux)
info: ---------------------------------
info: ---------------------------------
info: audio settings reset:
samples per sec: 44100
speakers: 2
info: ---------------------------------
info: Initializing OpenGL...
info: Loading up OpenGL on adapter Intel Open Source Technology Center Mesa DRI Intel(R) Sandybridge Mobile
info: OpenGL loaded successfully, version 3.3 (Core Profile) Mesa 18.3.6, shading language 3.30
info: ---------------------------------
info: video settings reset:
base resolution: 1024x768
output resolution: 680x512
downscale filter: Bicubic
fps: 30/1
format: RGBA
YUV mode: None
info: GPU conversion not available for format: 6
info: NV12 texture support not available
info: Audio monitoring device:
name: Default
id: default
info: ---------------------------------
warning: Failed to load 'en-US' text for module: 'decklink-ouput-ui.so'
libDeckLinkAPI.so: cannot open shared object file: No such file or directory
warning: A DeckLink iterator could not be created. The DeckLink drivers may not be installed
info: No blackmagic support
info: FFMPEG VAAPI supported
info: VLC found, VLC video source enabled
info: [Source Switcher] loaded version 0.4.1
*** buffer overflow detected ***: obs terminated
Aborted