Error:

 Building initial module for 4.15.0-20-generic
 lubuntu ubiquity: Done.
 lubuntu ubiquity: 
 lubuntu ubiquity: wl:
 lubuntu ubiquity: Running module version sanity check.
 lubuntu ubiquity:  - Original module
 lubuntu ubiquity:    - No original module exists within this kernel
 lubuntu ubiquity:  - Installation
 lubuntu ubiquity:    - Installing to 
/lib/modules/4.15.0-20-generic/updates/dkms/
 lubuntu ubiquity: 
 lubuntu ubiquity: depmod...
 lubuntu ubiquity: .
 lubuntu kernel: [  297.852883] depmod[5990]: segfault at 646e04 ip 0046ad3f sp 
bfe03ebc error 4 in kmod[455000+2b000]
 lubuntu kernel: [  304.145036] perf: interrupt took too long (6218 > 6211), 
lowering kernel.perf_event_max_sample_rate to 32000
 lubuntu ubiquity: message repeated 8 times: [ .]
 lubuntu ubiquity: (bad exit status: 139)
 lubuntu ubiquity: 
 lubuntu ubiquity: 
 lubuntu ubiquity: -------- Uninstall Beginning --------
 lubuntu ubiquity: Module:  bcmwl
 lubuntu ubiquity: Version: 6.30.223.271+bdcom
 lubuntu ubiquity: Kernel:  4.15.0-20-generic (i686)
 lubuntu ubiquity: -------------------------------------
 lubuntu ubiquity: 
 lubuntu ubiquity: Status: Before uninstall, this module version was ACTIVE on 
this kernel.
 lubuntu ubiquity: 
 lubuntu ubiquity: wl.ko:
 lubuntu ubiquity:  - Uninstallation
 lubuntu ubiquity: 
 lubuntu ubiquity:    - Deleting from: 
/lib/modules/4.15.0-20-generic/updates/dkms/
 lubuntu ubiquity:  - Original module
 lubuntu ubiquity:    - No original module was found for this module on this 
kernel.
 lubuntu ubiquity:    - Use the dkms install command to reinstall any previous 
module version.
 lubuntu ubiquity: 
 lubuntu ubiquity: 
 lubuntu ubiquity: depmod...
 lubuntu ubiquity: (bad exit status: 134)
 lubuntu ubiquity: 
 lubuntu ubiquity: 
 lubuntu ubiquity: DKMS: uninstall completed.
 lubuntu ubiquity: Error!
 lubuntu ubiquity: Problems with depmod detected.  Automatically uninstalling 
this module.
 lubuntu ubiquity: DKMS: Install Failed (depmod problems).  Module rolled back 
to built state.
 lubuntu ubiquity: dpkg: Fehler beim Bearbeiten des Paketes bcmwl-kernel-source 
(--configure):
 lubuntu ubiquity:  Unterprozess installed bcmwl-kernel-source package 
post-installation script gab den Fehler-Ausgangsstatus 6 zurück
 lubuntu ubiquity: Trigger für libc-bin (2.27-3ubuntu1) werden verarbeitet ...

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https://bugs.launchpad.net/bugs/1771548

Title:
  crashes while trying to re-install lubuntu to an older system.

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