I am running KDE Plasma 5.26.0 Distro: KDE neon 20.04 5.26 in a triple boot system with W10 and Manjaro.

The upgrade install gives an error:

Your EFI system partition (ESP) is not mounted at /boot/efi.
Ensure that it is properly configured and try again.


At the end of the abortive install, there is this:

Unit packagekit.socket does not exist, proceeding anyway.
Created symlink /run/systemd/system/packagekit.socket → /dev/null.
Created symlink /run/systemd/system/packagekit.service → /dev/null.
Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit packagekit.service is masked.
Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit packagekit.service is masked.
Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit packagekit.service is masked.
Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit packagekit.service is masked.
Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit packagekit.service is masked.
Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit packagekit.service is masked.
exitMainLoopMidFlight
None
None
Removed /run/systemd/system/packagekit.service.
Removed /run/systemd/system/packagekit.socket.

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howard@Ksnow-White:~$ inxi -F
System:
  Host: Ksnow-White Kernel: 5.15.0-46-generic x86_64 bits: 64
  Desktop: KDE Plasma 5.26.0 Distro: KDE neon 20.04 5.26
Machine:
  Type: Desktop Mobo: ASUSTeK model: Z170-E v: Rev 1.xx
  serial: <superuser/root required> UEFI: American Megatrends v: 3801
  date: 03/14/2018
CPU:
  Topology: Quad Core model: Intel Core i5-6600K bits: 64 type: MCP
  L2 cache: 6144 KiB
  Speed: 800 MHz min/max: 800/3900 MHz Core speeds (MHz): 1: 800 2: 800 3: 800
  4: 800
Graphics:
  Device-1: AMD Baffin [Radeon RX 460/560D / Pro 450/455/460/555/555X/560/560X]
  driver: amdgpu v: kernel
  Display: x11 server: X.Org 1.20.13 driver: amdgpu,ati
  unloaded: fbdev,modesetting,vesa resolution: 2560x1440~60Hz
  OpenGL: renderer: AMD Radeon RX 460 Graphics (POLARIS11 DRM 3.42.0
  5.15.0-46-generic LLVM 12.0.0)
  v: 4.6 Mesa 21.2.6
Audio:
  Device-1: Intel 100 Series/C230 Series Family HD Audio driver: snd_hda_intel
  Device-2: AMD Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X]
  driver: snd_hda_intel
  Device-3: C-Media CMI8788 [Oxygen HD Audio] driver: snd_virtuoso
  Sound Server: ALSA v: k5.15.0-46-generic
Network:
  Device-1: Intel Ethernet I219-V driver: e1000e
  IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac: 38:d5:47:df:6e:5b
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169
  IF: enp4s0 state: down mac: 7c:8b:ca:01:bf:b8
Drives:
  Local Storage: total: 7.28 TiB used: 305.11 GiB (4.1%)
  ID-1: /dev/sda vendor: Western Digital model: WD2003FZEX-00Z4SA0 size: 1.82 TiB
  ID-2: /dev/sdb vendor: Samsung model: SSD 860 QVO 1TB size: 931.51 GiB
  ID-3: /dev/sdc vendor: Western Digital model: WD10EZEX-08M2NA0 size: 931.51 GiB
  ID-4: /dev/sdd vendor: Western Digital model: WD4004FZWX-00GBGB0 size: 3.64 TiB
Partition:
  ID-1: / size: 1.32 TiB used: 40.76 GiB (3.0%) fs: ext4 dev: /dev/sda2
Sensors:
  System Temperatures: cpu: 31.0 C mobo: N/A gpu: amdgpu temp: 51 C
  Fan Speeds (RPM): N/A gpu: amdgpu fan: 800
Info:
  Processes: 203 Uptime: 42m Memory: 15.56 GiB used: 1.68 GiB (10.8%) Shell: bash
  inxi: 3.0.38
howard@Ksnow-White:~$


I'd be grateful for advice.

On my system, the EFI partition is mounted at the right place by the following line in /etc/fstab:

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UUID=BA41-3F1D                            /boot/efi      vfat    defaults                    0 2

where UUID=BA41-3F1D is /dev/sda1

Thanks.

Not sure that I get your drift, however. I have no knowledge whatsoever about fstab.

Here is the file. If you can help further, I'd be grateful.

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# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda2 during installation
UUID=b0f459db-1540-4214-aedc-78b985e72330   /   ext4   errors=remount-ro   0   1
# /boot/efi was on /dev/sda1 during installation
#UUID=607D-E837   /boot/efi   vfat   umask=0077   0   1
/swapfile   none   swap   sw   0   0
UUID=607D-E837  /boot/efi       vfat    defaults      0       1


I think you probably need to remove the '#' at the beginning of the line:

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#UUID=607D-E837   /boot/efi   vfat   umask=0077   0   1

so that it reads:

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UUID=607D-E837   /boot/efi   vfat   umask=0077   0   1

(the '#' effectively disables that line by turning it into a comment)
then execute the following command in a terminal:

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sudo mount /boot/efi

and try the upgrade again

Ah! I see that.

Trouble is that the OS has developed further problems:

After the aborted 22.04 install I lost several 3rd party applications, including most of LibreOffice - for some reason Math survived.

I reinstalled it and all was fine until I did a full upgrade this morning. After this, LibreOffice had disappeared again.

When I tried to reboot, the OS would not install.

Sometimes, only sometimes, I am glad I still have Windows.