I installed ubuntu 16.04.3 on my computer but there's no sound

Memory blocks currently allocated: 1, size: 63.9 KiB. Memory blocks allocated during the whole lifetime: 1, size: 63.9 KiB. Memory blocks imported from other processes: 0, size: 0 B. Memory blocks exported to other processes: 0, size: 0 B. Total sample cache size: 0 B. Default sample spec: s16le 2ch 44100Hz Default channel map: front-left,front-right Default sink name: auto_null Default source name: auto_null.monitor Memory blocks of type POOL: 1 allocated/1 accumulated. Memory blocks of type POOL_EXTERNAL: 0 allocated/0 accumulated. Memory blocks of type APPENDED: 0 allocated/0 accumulated. Memory blocks of type USER: 0 allocated/0 accumulated. Memory blocks of type FIXED: 0 allocated/0 accumulated. Memory blocks of type IMPORTED: 0 allocated/0 accumulated. 25 module(s) loaded. index: 0 name: <module-device-restore> argument: <> used: -1 load once: yes properties: module.author = "Lennart Poettering" module.description = "Automatically restore the volume/mute state of devices" module.version = "8.0" index: 1 name: <module-stream-restore> argument: <> used: -1 load once: yes properties: module.author = "Lennart Poettering" module.description = "Automatically restore the volume/mute/device state of streams" module.version = "8.0" index: 2 name: <module-card-restore> argument: <> used: -1 load once: yes properties: module.author = "Lennart Poettering" module.description = "Automatically restore profile of cards" module.version = "8.0" index: 3 name: <module-augment-properties> argument: <> used: -1 load once: yes properties: module.author = "Lennart Poettering" module.description = "Augment the property sets of streams with additional static information" module.version = "8.0" index: 4 name: <module-switch-on-port-available> argument: <> used: -1 load once: no properties:

index: 5
name: <module-udev-detect>
argument: <>
used: -1
load once: yes
properties:
    module.author = "Lennart Poettering"
    module.description = "Detect available audio hardware and load matching drivers"
    module.version = "8.0"
index: 6
name: <module-bluetooth-policy>
argument: <>
used: -1
load once: yes
properties:
    module.author = "Frédéric Dalleau, Pali Rohár"
    module.description = "Policy module to make using bluetooth devices out-of-the-box easier"
    module.version = "8.0"
index: 7
name: <module-bluetooth-discover>
argument: <>
used: -1
load once: yes
properties:
    module.author = "João Paulo Rechi Vita"
    module.description = "Detect available Bluetooth daemon and load the corresponding discovery module"
    module.version = "8.0"
index: 8
name: <module-bluez5-discover>
argument: <>
used: -1
load once: yes
properties:
    module.author = "João Paulo Rechi Vita"
    module.description = "Detect available BlueZ 5 Bluetooth audio devices and load BlueZ 5 Bluetooth audio drivers"
    module.version = "8.0"
index: 9
name: <module-native-protocol-unix>
argument: <>
used: -1
load once: no
properties:
    module.author = "Lennart Poettering"
    module.description = "Native protocol (UNIX sockets)"
    module.version = "8.0"
index: 10
name: <module-default-device-restore>
argument: <>
used: -1
load once: yes
properties:
    module.author = "Lennart Poettering"
    module.description = "Automatically restore the default sink and source"
    module.version = "8.0"
index: 11
name: <module-rescue-streams>
argument: <>
used: -1
load once: yes
properties:
    module.author = "Lennart Poettering"
    module.description = "When a sink/source is removed, try to move its streams to the default sink/source"
    module.version = "8.0"
index: 12
name: <module-always-sink>
argument: <>
used: -1
load once: yes
properties:
    module.author = "Colin Guthrie"
    module.description = "Always keeps at least one sink loaded even if it's a null one"
    module.version = "8.0"
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