Hi Inton, 
        
Did you resolve this issue? I had the same error come up
          today after an automatic update run by Linux (Ubuntu 20.04.5)
          and now I am unable to run NEST (version 3.4). 
        
        
        If not, some more information for other users, in case
          anyone can help:
        I ran an automatic update on my computer (running Linux Ubuntu
        20.04.5) and now NEST is unable to find the sli file. I receive
        the following error:
        
        Mar 02 10:59:03 SLIStartup [Fatal]: 
            SLI initialisation file not found at 
           
        /build/nest-UTZ2DW/nest-3.4/debian/nest/usr/share/nest/sli/sli-init.sli.
            Please check your NEST installation.
        
        I tried updating the nest-config file to use the path where I
        know the sli file is located but I get the same error. The
        update log is pasted below to show what has been updated. NEST
        was running yesterday (01/03) so it seems it has something to do
        with the auto update that ran today (02/03). The log also
        reflects my attempts at updating NEST and python in case this
        was the issue, unfortunately, it did not resolve the error.
        
        Update log:
        Start-Date: 2023-03-01  09:10:08
        Commandline: /usr/bin/unattended-upgrade
        Upgrade: libgnutls-openssl27:amd64 (3.6.13-2ubuntu1.7,
        3.6.13-2ubuntu1.8), libgnutls30:amd64 (3.6.13-2ubuntu1.7,
        3.6.13-2ubuntu1.8)
        End-Date: 2023-03-01  09:10:09
        
        Start-Date: 2023-03-01  09:10:11
        Commandline: /usr/bin/unattended-upgrade
        Upgrade: python3-pip:amd64 (20.0.2-5ubuntu1.7,
        20.0.2-5ubuntu1.8), python-pip-whl:amd64 (20.0.2-5ubuntu1.7,
        20.0.2-5ubuntu1.8)
        End-Date: 2023-03-01  09:10:13
        
        Start-Date: 2023-03-01  09:10:16
        Commandline: /usr/bin/unattended-upgrade
        Upgrade: tar:amd64 (1.30+dfsg-7ubuntu0.20.04.2,
        1.30+dfsg-7ubuntu0.20.04.3)
        End-Date: 2023-03-01  09:10:19
        
        Start-Date: 2023-03-02  09:37:05
        Commandline: /usr/bin/unattended-upgrade
        Upgrade: firefox:amd64 (110.0+build3-0ubuntu0.20.04.1,
        110.0.1+build2-0ubuntu0.20.04.1)
        End-Date: 2023-03-02  09:37:09
        
        Start-Date: 2023-03-02  09:37:11
        Commandline: /usr/bin/unattended-upgrade
        Upgrade: firefox-locale-en:amd64 (110.0+build3-0ubuntu0.20.04.1,
        110.0.1+build2-0ubuntu0.20.04.1)
        End-Date: 2023-03-02  09:37:11
        
        Start-Date: 2023-03-02  09:38:25
        Commandline: aptdaemon role='role-commit-packages'
        sender=':1.129'
        Upgrade: google-chrome-stable:amd64 (110.0.5481.100-1,
        110.0.5481.177-1), isc-dhcp-common:amd64
        (4.4.1-2.1ubuntu5.20.04.4, 4.4.1-2.1ubuntu5.20.04.5), nest:amd64
        (3.3-0~202205050735~ubuntu20.04.1,
        3.4-0~202302251246~ubuntu20.04.1), isc-dhcp-client:amd64
        (4.4.1-2.1ubuntu5.20.04.4, 4.4.1-2.1ubuntu5.20.04.5)
        End-Date: 2023-03-02  09:38:34
        
        Start-Date: 2023-03-02  10:24:37
        Commandline: apt-get upgrade nest
        Requested-By: bs (1000)
        Upgrade: python3-software-properties:amd64 (0.99.9.10,
        0.99.9.11), metacity:amd64 (1:3.36.1-1, 1:3.36.1-1ubuntu1),
        software-properties-gtk:amd64 (0.99.9.10, 0.99.9.11),
        libmetacity1:amd64 (1:3.36.1-1, 1:3.36.1-1ubuntu1),
        metacity-common:amd64 (1:3.36.1-1, 1:3.36.1-1ubuntu1),
        software-properties-common:amd64 (0.99.9.10, 0.99.9.11)
        End-Date: 2023-03-02  10:24:40
        
        Start-Date: 2023-03-02  10:55:40
        Commandline: apt autoremove
        Requested-By: bs (1000)
        Remove: gnome-applets-data:amd64 (3.36.4-0ubuntu1),
        gnome-panel-data:amd64 (1:3.36.2-0ubuntu1), libxmlb1:amd64
        (0.1.15-2ubuntu1~20.04.1), alacarte:amd64 (3.36.0-1),
        libllvm10:amd64 (1:10.0.0-4ubuntu1), gir1.2-goa-1.0:amd64
        (3.36.1-0ubuntu1), libphobos2-ldc-shared90:amd64 (1:1.20.1-1),
        libcpufreq0:amd64 (008-1.1), libpanel-applet3:amd64
        (1:3.36.2-0ubuntu1)
        End-Date: 2023-03-02  10:55:42
        
        Start-Date: 2023-03-02  10:57:17
        Commandline: apt install python3-all dh-python
        Requested-By: bs (1000)
        Install: python3-all:amd64 (3.8.2-0ubuntu2)
        End-Date: 2023-03-02  10:57:18