Segmentation Fault installing Kernel 7.1.2

[TheMowgliMan]

My system in Kubuntu 26.04 LTS running mainline kernel 7.0.5-070005. Attempting to install 7.1.2 causes a segmentation fault. I had previously tried, but it didn't boot to 7.1.2 and GRUB did not list it (perhaps because of #374 ) so I removed it and tried again, leading to the following error (as reported by Kubuntu):

           PID: 10684 (mainline)
           UID: 1000 (<*username*>)
           GID: 1000 (<*username*>)
        Signal: 11 (SEGV)
     Timestamp: Fri 2026-07-03 09:12:10 EDT (3s ago)
  Command Line: mainline --from-gui install 7.1.2
    Executable: /usr/bin/mainline
 Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/vte-spawn-4a940c63-f3b2-419b-ae98-e1858a5360f7.scope
          Unit: user@1000.service
     User Unit: vte-spawn-4a940c63-f3b2-419b-ae98-e1858a5360f7.scope
         Slice: user-1000.slice
     Owner UID: 1000 (<*username*>)
       Boot ID: 52a022e26d7d45f9accf7f24bebf4343
    Machine ID: b6a2c849aca341e29df9c825cd64e40f
      Hostname: fortune-cookie
       Storage: /var/lib/systemd/coredump/core.mainline.1000.52a022e26d7d45f9accf7f24bebf4343.10684.1783084330000000.zst (present)
  Size on Disk: 396K
       Package: mainline/1.4.13-0~202604150752~ubuntu25.10.1
      build-id: db48b5d6b1bc11ba11612824c4701fdfa2c522c5
       Message: Process 10684 (mainline) of user 1000 dumped core.
                
                Module /usr/bin/mainline from deb glibc-2.42-0ubuntu3.1.amd64
                Module /usr/bin/mainline from deb mainline-1.4.13-0~202604150752~ubuntu25.10.1.amd64
                Module linux-vdso.so.1 from deb linux-7.0.5-070005.202605080745.amd64
                Module libblkid.so.1 from deb util-linux-2.41.3-3ubuntu2.amd64
                Module libpcre2-8.so.0 from deb pcre2-10.46-1build1.amd64
                Module libatomic.so.1 from deb gcc-16-16-20260322-1ubuntu1.amd64
                Module libffi.so.8 from deb libffi-3.5.2-4.amd64
                Module libselinux.so.1 from deb libselinux-3.9-4build1.amd64
                Module libmount.so.1 from deb util-linux-2.41.3-3ubuntu2.amd64
                Module libz.so.1 from deb zlib-1:1.3.dfsg+really1.3.1-1ubuntu3.amd64
                Module libgmodule-2.0.so.0 from deb glib2.0-2.88.0-1.amd64
                Module libglib-2.0.so.0 from deb glib2.0-2.88.0-1.amd64
                Module libgobject-2.0.so.0 from deb glib2.0-2.88.0-1.amd64
                Module libgio-2.0.so.0 from deb glib2.0-2.88.0-1.amd64
                Module libjson-glib-1.0.so.0 from deb json-glib-1.10.8+ds-2.amd64
                Module libgee-0.8.so.2 from deb libgee-0.8-0.20.8-2.amd64
                Stack trace of thread 10684:
                #0  0x00007db17f257e04 __GI_____strtol_l_internal (libc.so.6 + 0x57e04)
                #1  0x000064a72cb2b942 n/a (/usr/bin/mainline + 0xd942)
                #2  0x000064a72cb36533 n/a (/usr/bin/mainline + 0x18533)
                #3  0x000064a72cb3790f n/a (/usr/bin/mainline + 0x1990f)
                #4  0x000064a72cb372a3 n/a (/usr/bin/mainline + 0x192a3)
                #5  0x000064a72cb495c6 n/a (/usr/bin/mainline + 0x2b5c6)
                #6  0x000064a72cb4571f n/a (/usr/bin/mainline + 0x2771f)
                #7  0x000064a72cb45803 n/a (/usr/bin/mainline + 0x27803)
                #8  0x00007db17f22a601 __libc_start_call_main (libc.so.6 + 0x2a601)
                #9  0x00007db17f22a718 __libc_start_main_impl (libc.so.6 + 0x2a718)
                #10 0x000064a72cb233b5 n/a (/usr/bin/mainline + 0x53b5)
                
                Stack trace of thread 10707:
                #0  0x00007db17f2acae2 __syscall_cancel_arch (libc.so.6 + 0xacae2)
                #1  0x00007db17f2a067c __internal_syscall_cancel (libc.so.6 + 0xa067c)
                #2  0x00007db17f327e4e __GI___poll (libc.so.6 + 0x127e4e)
                #3  0x00007db17f80fac1 n/a (libgio-2.0.so.0 + 0xddac1)
                #4  0x00007db17f7bb6c6 g_input_stream_read (libgio-2.0.so.0 + 0x896c6)
                #5  0x00007db17f781a55 n/a (libgio-2.0.so.0 + 0x4fa55)
                #6  0x00007db17f782704 g_buffered_input_stream_fill (libgio-2.0.so.0 + 0x50704)
                #7  0x00007db17f78ccc5 g_data_input_stream_read_line (libgio-2.0.so.0 + 0x5acc5)
                #8  0x000064a72cb41a95 n/a (/usr/bin/mainline + 0x23a95)
                #9  0x000064a72cb41308 n/a (/usr/bin/mainline + 0x23308)
                #10 0x00007db17f60d279 n/a (libglib-2.0.so.0 + 0x97279)
                #11 0x00007db17f2a40da start_thread (libc.so.6 + 0xa40da)
                #12 0x00007db17f3377ac __clone3 (libc.so.6 + 0x1377ac)
                ELF object binary architecture: AMD x86-64

All of this was performed via the GUI, Mainline version 1.4.13.